Ch. 3 Network Components
You must decide whether to purchase 110 blocks or 66 blocks for the wiring in a new building. Which statement is not an advantage of a 110 block over a 66 block?
A 110 block does not use a punch-down tool.
Which of the following is a cross-connect block that was popular for cross-connecting Cat 3 UTP cables for 10 Mbps Ethernet LANs, but does not support higher-speed LAN technologies, such as 100 Mbps Ethernet LANs?
A 66 block is cross-connect block that was traditionally used in corporate environments for cross-connecting phone system cabling. As 10 Mbps LANs started to grow in popularity, in the late 80s and early 90s, these termination blocks were used to cross-connect Cat 3 unshielded twisted pair (UTP) cabling. The electrical characteristics (specifically, cross-talk) of a 66 block, however, do not support higher-speed LAN technologies, such as 100 Mbps Ethernet networks. A smart jack is a type of network interface device that adds circuitry. This circuitry adds such features as converting between framing formats on a digital circuit (for example, a T1), supporting remote diagnostics, and regenerating a digital signal. Since 66 blocks are subject to too much cross-talk for higher-speed LAN connections, 110 blocks can be used to terminate a cable (for example, a Cat 5 cable) being used for those higher-speed LANs. An NT1 is an ISDN device that interconnects a 4-wire ISDN circuit with a 2-wire ISDN circuit.
What is a DHCP lease?
A DHCP lease is a temporary assignment of IP address information to a DHCP client.
You will have a very small wiring closet for your routers. While the company will use fiber-optic cabling, you would like to use the smallest form connector to conserve space. The connector you plan to use should be roughly half the size of the other connectors. Which fiber-optic connector should you use?
A Lucent Connector (LC) fiber-optic connector is roughly half the size of other fiber-optic connectors. Its smaller form allows for more space in the wiring closet.
Which of the following DNS record types points to a canonical name and is commonly used when performing a reverse DNS lookup?
A Pointer (PTR) record points to a canonical name and is commonly used when performing a reverse DNS lookup, which is a process used to determine what domain name is associated with a known IP address.
Which of the following DNS record types provides authoritative information about a DNS zone (for example, the e-mail address of a DNS zone's administrator, the zone's primary name server, and various refresh timers)?
A Start of Authority (SOA) record provides authoritative information about a DNS zone, such as: e-mail contact information for the zone's administrator, the zone's primary name server, and various refresh timers.
2 examples of top-level domains?
A fully-qualified domain name (FQDN) is a series of strings delimited by a period. The right-most string represents the root domain. Examples of root domains include: .com, .mil, .gov, and .edu. The string "pearsonitcertification.com" is a FQDN, rather than a root domain. The root domain of the FQDN is .com. Similarly, "eku.edu" is a FQDN, rather than a root domain, and the root domain of the FQDN is .edu.
Which of the following is a telephony solution that is typically based on a traditional privately-owned telephone system?
A hosted private branch exchange (PBX) is a telephony system hosted by a service provider, rather than being hosted by the company using the PBX as their telephone system.
Your company has recently leased the office next door to the one currently being used. Both offices will be used. The current office has a Cat 6 network installed. The new office has a fiber network installed. You need to connect the networks of the two offices. Which device should you use?
A media converter should be used to connect the networks of the two offices because they use two different types of media. Media converters work on the Physical layer of the OSI model.
You are explaining the function of a multi-layer switch to several junior administrators. On which data can multi-layer switches make routing decisions?
A multi-layer switch, which operates at Layers 2, 3, and 4 of the OSI model, can make routing decisions based on the following criteria:MAC address - a Data Link layer (Layer 2) functionIP address - a Network layer (Layer 3) functionProtocol - a Network layer (Layer 3) functionPort number - a Transport layer (Layer 4) functionA multi-layer switch has 24 collision domains.You can also purchase switches that offer services at only one layer of the OSI model. Layer 2 switches only route based on the MAC address. Layer 3 switches route based on the IP address or protocol. Layer 4 switches only route based on the port number.
Why might a network using DHCP for IP address assignment need a DHCP relay agent?
A router resides between a DHCP client and a DHCP server.
Identify the purpose of a DHCP scope.
A scope acts as a pool of IP addresses from which a DHCP server can assign IP addresses to DHCP clients.
Which type of fiber optic connector is often referred to as a bayonet connector?
A straight tip (ST) connector is sometimes referred to as a bayonet connector, due to the way it locks into place with a twist, similar to a bayonet on a military rifle. ST connectors are most commonly used with multimode fiber (MMF). An ST connector connects to a terminating device by pushing the connector into the terminating equipment and then twisting the connector housing to lock it in place.
Which of the following protocols resolves an IP address of a network device to a corresponding MAC address?
Address Resolution Protocol (ARP) is a protocol that can resolve a known IP address of a network device to a corresponding MAC address. For example, when a PC wishes to communicate with a specific IP address on the network, it needs a corresponding MAC address. So, the PC sends an ARP broadcast to determine the MAC address to which frames should be sent in order to reach the desired destination MAC address. If the destination IP address is on a different subnet from the sending PC, then the MAC address learned from the PC's ARP request is the MAC address of the PC's default gateway, rather than the MAC address of the destination network device.
You are setting up a 10-Mbps SOHO network at a residence. What is the lowest category or level of UTP cable that you should use as transmission medium for a small LAN communicating in the 10-Mbps range?
Although you could use Category 3 or Category 5 cable for the LAN, Category 3 is the lowest category cable that you could use for the LAN. Category 1 and Category 2 cable have maximum transmission rates of only 4 Mbps, so they would not be suitable for a 10-Mbps network.UTP transmission rates are listed below:Category 1 - up to 4 MbpsCategory 2 - up to 4 MbpsCategory 3 - up to 10 MbpsCategory 4 - up to 16 MbpsCategory 5 - up to 100 MbpsCategory 5e - up to 1000 MbpsCategory 6 - up to 1000 Mbps or 1 GbpsCategory 6a - up to 10 GbpsCategory 7 - up to 10 Gbps
Which of the following copper connector types is most commonly used for cable TV connections?
An F-connector is frequently used for cable TV (including cable modem) connections.
Which of the following technologies is used by an application service provider (ASP) to give subscribers access to application software?
An application service provider (ASP) provides application software access to subscribers. This service is sometimes called Software as a Service (SaaS).
What is the name of the wireless protocol used in a sensor to relay information such as a person's heart rate or a car's tire pressure?
Ant+ is a protocol used in sensors to communicate data. Common devices that use Ant+ include heart monitors and tire pressure monitoring systems.
What IoT technology is specialized for monitoring sensor data and is ultimately led by Garmin?
Ant+ is found in IoT and is specialized wireless for monitoring sensor data. Garmin helped create this technology.
What is the name of the wireless technology that can create a personal area network (PAN)?
Bluetooth
Your network contains four segments. You need to connect two or more of the LAN segments together. Which network devices can you use? (4)
Bridges, switches, and routers can be used to connect multiple LAN segments. For the Network+ exam, you need to understand the placement of these devices. Bridges, switches, and routers are implemented on the perimeters of segments or subnetworks and are used to connect those segments together. A Wireless Access Point (WAP) is essentially a translational bridge. One side is commonly connected to the wired LAN and the other side communicates using IEEE 802.11b with a wireless connection. WAPs are not Physical layer devices like hubs or repeaters. They selectively transmit traffic based upon MAC addresses. A WAP can also function as a repeater. WAPs are placed in the center of an area to which you want to provide wireless access.
Which of the following DNS record types is an alias of an existing record?
CNAME.A Canonical Name (CNAME) record is an alias of an existing record, thus allowing multiple DNS records to map to the same IP address. An IPv6 Address (AAAA) record is used to map a hostname to an IPv6 address. A Start of Authority (SOA) record provides authoritative information about a DNS zone, such as: e-mail contact information for the zone's administrator, the zone's primary name server, and various refresh timers. A Mail Exchange (MX) record maps a domain name to an e-mail (or message transfer agent) server for that domain.
Cables in wiring closets commonly terminate on what?
Cables in wiring closets commonly terminate on a patch panel. A patch panel might consist of some sort of cross-connect block wired into a series of ports (for example, RJ-45 ports), which could be used to quickly interconnect cables coming from end-user offices with a network device, such as an Ethernet switch.
Which of the following categories of UTP cabling are commonly used for 1000BASE-T networks?
Cat 5e and Cat 6 are often used for Fast Ethernet networks.
Which type of unshielded twisted pair (UTP) is commonly used in Ethernet 10BASE-T networks, which carry data at a rate of 10 Mbps (although it can carry data at a maximum rate of 16 Mbps, as seen in some Token Ring networks)?
Category 3 (Cat 3) cable is commonly used in Ethernet 10BASE-T networks, which carry data at a rate of 10 Mbps (where Mbps stands for megabits per second, meaning millions of bits per second). However, Cat 3 cable can carry data at a maximum rate of 16 Mbps, as seen in some Token Ring networks.
Which type of unshielded twisted pair (UTP) cable uses 24 gauge wiring and is commonly used in Ethernet 100BASE-TX networks, which carry data at a rate of 100 Mbps, although it is capable of carrying traffic at a rate of 155 Mbps on older implementations of ATM networks? (NOTE: This type of UTP should not be used for networks running at speeds of 1 Gbps or higher.)
Category 5 (Cat 5) cable is commonly used in Ethernet 100BASE-TX networks, which carry data at a rate of 100 Mbps. However, Cat 5 cable can be used to carry ATM traffic at a rate of 155 Mbps. Most Cat 5 cables consist of four pairs of 24 gauge wires. Each of these pairs is twisted, with a different number of twists per meter. However, on average, one pair of wires has a twist every five cm.
Which type of unshielded twisted pair (UTP) cable is commonly used for 1000BASE-T Ethernet networks and is often made of relatively thick conductors (for example, 22 gauge or 23 gauge wire) and thick insulation?
Category 6 (Cat 6) cable is commonly used for 1000BASE-T Ethernet networks. Some Cat 6 cable is made of thicker conductors (for example, 22 gauge or 23 gauge wire), although some Cat 6 cable is made from the same 24 gauge wire used by Cat 5 and Cat 5e. Cat 6 cable does have thicker insulation and offers reduced crosstalk, as compared with Cat 5e.
You have recently moved several servers that contain confidential information onto a DMZ. What is the most likely valid reason for doing this?
Compliance with federal and state regulations
A router operating at Layer 3 primarily makes its forwarding decisions based on what address?
Destination IP address.Routers make their forwarding decisions using IP addresses at Layer 3 of the OSI model. Specifically, the destination IP address is the key piece of information used by default.
You have been asked to implement a protocol that will manage the fully qualified domain name (FQDN) to IP address mappings. Which protocol should you implement?
Domain Name System (DNS) is the protocol that will manage the FQDN to IP address mappings. DNS works at the Application layer of the OSI model. The DNS database will include the following record types:-Host (A) record for IPv4-Host (AAAA) record for IPv6-Pointer (PTR) record-Canonical name (CNAME) record-Mail exchanger (MX) record-Name server (NS) record
What variant of Domain Name System (DNS) overcomes the size limitations of the original version of DNS through the use of pseudo-resource-records?
EDNSExtension Mechanisms for DNS (EDNS) supports features not supported in the original version of DNS (for example, security) while maintaining backward compatibility with the original version of DNS. Rather than using new flags in the header, which would impact backward compatibility, EDNS sends optional pseudo-resource-records between devices supporting EDNS. These records support sixteen new DNS flags.
Management at your company has recently become very concerned with interference or signal capture via the network cabling. You must advise them on which type of network media is the least susceptible to interference or signal capture. Which type provides this?
Fiber-optic cable carries its signals in the form of modulated pulses of light. Because fiber-optic uses light pulses rather than electric signals, it is virtually impossible to intercept the signal without interrupting it and, thus, being detected.In addition, fiber-optic cable is not susceptible to interference. It can span distances of up to 2 kilometers, or 2,000 meters (6,562 feet), and transmit data at a rate in excess of 100 Mbps. However, fiber-optic cable is the most expensive type of networking cable.Fiber-optic cable has three patch cable assemblies: Physical Contact (PC), Ultra Physical Contact (UPC), and Angled Physical Contact (APC). These refer to the polish style of fiber optic ferrules. Fiber-optic connectors use ceramic ferrules for connection, and different fiber optic connectors use different ferrule size and length and polish styles.PC type provides 40dB return loss or higher. UPC provides 50dB or higher. APC provides 60dB or higher. The higher the return loss, the better the performance. Single-mode fiber-optic cables use all three types connectors, while multi-mode only uses PC and UPC connectors.
You work for a company that deploys wireless networks for your customers. You have been asked to deploy wireless range extenders for several companies. For which of the following situations does deploying a wireless range extender make sense?
For a sprawling small office/home office layout with no more than 10 devices active at any given time, but with two dead spots in need of improved wireless network access
Computer A needs the IP address of Computer B, but Computer A only knows Computer B's FQDN. Which of the following is most likely to contain this information?
Forward zone.The forward lookup zone is most likely to contain the IP address of Computer B. When comparing forward vs reverse zones, the forward lookup zone provides the association between devices on a domain and their corresponding IP address. As an example, it would contain a record that says mypc.mydomain.com has IP address 192.168.5.1. If another machine on the network needed the IP address for mypc.mydomain.com, it would query the forward lookup zone on the DNS server, find the record for mypc.mydomain.com, and retrieve the IP address. Reverse lookup zones do just the opposite, listing the records by IP address and then providing the FQDN. When comparing internal vs external DNS, the internal DNS would reside within the enterprise's networks and provide "local" name resolution. An external DNS server would be one that not only provides resolution for your domain, but others as well. While the query may go to the DNS server, the information is actually containing in the lookup zones located on the servers. Another type of DNS server is a third party/cloud-hosted DNS. Third-party DNS uses servers provided by Google Public DNS, OpenDNS, or UltraDNS. Cloud-hosted DNS is based on platforms like Amazon AWS's Route 53 and Microsoft Azure DNS. When discussing DNS hierarchy, at the top you have the root domain. When a DNS query comes in (such as a query for mail.mydomain.com), the root will direct the query to the DNS server responsible for the URL's top-level domain, such as the .com DNS server (or the .gov DNS server, the .mil DNS server and so forth). The .com DNS server then directs the query to the domain name server for mydomain.com. When the name server for mydomain.com finds the listings, it locates the subdomain mail.mydomain.com, and retrieves the IP address for the computer responsible for mail.mydomain.com.
An administrator would like to integrate DNS and DHCP so that each is aware of changes in the other. Which of the following would be the best method for him to do this?
IP Address Management (IPAM) allows integration of DNS and DHCP so that each is aware of the changes in the other. IPAM allows for the discovery of servers associated with an IP address infrastructure responsibility on the network and the ability to manage those servers from a central point. Some things that IPAM can allow a network administrator to manage include:-IP address availability - how many unassigned IP addresses exists-Subnet identification, subnet size, and which subnet is associated with which segment-Static/dynamic status for each subnet address-Default routers that the various network devices use.-IP address host name-IP address and associated hardware
Your company has a corporate-wide Windows Server network using the TCP/IP protocol. Several users are complaining that their computers are getting IP address conflicts. Which action should you perform?
Implement a DHCP server.A Dynamic Host Configuration Protocol (DHCP) server dynamically assigns IP addresses to DHCP clients. This ensures that each client receives a valid and unique IP address, preventing IP address conflicts.
Users on your network have access to the Internet. As more users access the Internet, bandwidth starts to diminish, causing Web pages to load slowly. After looking at the Web server logs, you have noticed that many of the same Web sites are being accessed by multiple users. What should you do to improve your company's Internet bandwidth?
Implement an HTTP proxy server.Proxy servers fulfill requests on the behalf of others. There are several kinds of proxy servers, including HTTP proxy, IP proxy, and FTP proxy. An HTTP proxy server is placed between the clients and the Internet. Frequently accessed files are placed in the cache on this server. When a client requests a file that is in the proxy cache, it will be downloaded from the proxy server rather than from the source, potentially lowering bandwidth usage. A proxy server can be configured to retrieve the originals of frequently requested files during low Internet usage hours so that content does not become outdated.
Your company plans to redesign its network in the coming months. As part of this redesign, a guest network will be set up to allow any guests to have Internet access. This guest network will be a public network that it isolated from your private corporate network. What does this network segmentation provide?
Improved security through isolation.Implementing a separate guest network will provide improved security through isolation. Because the guest network is isolated, you can set up security controls to ensure that guests cannot communicate with the private corporate network.None of the other solutions are provided by the network segmentation. Link aggregation occurs when two links work together to provide better throughput. High availability through redundancy is ensured when redundant systems are implemented, such as redundant WAN links or redundant RAID arrays. Improved network performance for internal personnel cannot be ensured based on the implementation you have described. The only way to ensure improved network performance for internal personnel is to implement Quality of Service (QoS) or some other technology that allows you to regulate traffic.
Which of the following can be manipulated to reduce network traffic?
Increased lease time.Lease time can be manipulated to reduce network traffic. Lease time is the amount of time a device maintains the IP address assigned by the DHCP server. With Windows, the default lease time is 8 days. Lease times may be adjusted. As an example, if the network configuration seldom changes and you have a large number of IP addresses, you might consider increasing the lease time. The justification for doing so is that every lease must be renewed, and those renewals increase network traffic. Increasing the duration of the lease reduces the amount of network traffic required for lease renewal.
A building might have multiple patch panels (for example, on different floors of a building). These common locations, where cables from nearby offices terminate, are often called what?
Intermediate distribution frames.A building might have multiple patch panels (for example, on different floors of a building). These common locations, where cables from nearby office home back to, are often called intermediate distribution frames (IDFs). The two most popular types of cross-connect blocks found in an IDF are 66 blocks and 110 blocks.
Which of the following is a primary benefit of a VPN concentrator?
It allows traffic to travel securely over an untrusted network (for example, the Internet).
You decide to implement a DHCP server on your network. What is the purpose of a DHCP scope?
It is the range of IP addresses that a DHCP server can temporarily assign.
What is the purpose of a pointer (PTR) DNS record?
It maps an IP address to a hostname.
You notice that the new cabling that was purchased is rated as "plenum". What does this indicate about the cable?
It will not produce toxic gas when it burns.
A DHCP server can be used to assign a temporary IP address to a DHCP client, as opposed to a network administrator statically configuring an IP address on that client. What is this temporary IP address assignment called?
Lease.When a network device is assigned an IP address from an appropriate DHCP scope, that assignment is not permanent. Rather it is a temporary assignment referred to as a lease.
Which of the following systems would be best isolated on a separate network segment?
Legacy systems.Legacy systems would be best isolated on a separate network segment. Network segmentation limits the exposure of these systems and reduces the attack surface by limiting it to only specific groups of users. In addition, you could configure the legacy systems so that they can only be accessed remotely using secure shell (SSH) or some other secure remote access technology.It is not necessary to isolate any of the other listed systems on a separate network. Kerberos, Remote Authentication Dial-In User Service (RADIUS), and Voice over Internet Protocol (VoIP) are designed to be implemented on corporate networks without segmenting them from regular network traffic.
Which network appliance is also known as a content switch?
Load balancerFor companies with a large Internet presence (for example, a search engine company, an online bookstore, or a social networking site), a single server could be overwhelmed with the glut of requests flooding in from the Internet. To alleviate the burden placed on a single server, a content switch (also known as a load balancer) distributes incoming requests across the multiple servers in the server farm, where all of the servers contain the same data.
Your company has a main office and three branch offices throughout the United States. Management has decided to deploy a cloud solution that will allow all offices to connect to the same single-routed network and thereby connect directly to the cloud. Which of the following is the best solution? -P2P-MPLS VPN-Site-to-site VPN-Client-to-site VPN
MPLS VPNThe best solution is to deploy a Multiprotocol Label Switching Layer 3 (MPLS L3) virtual private network (VPN). This will allow all offices to connect to the same single-routed network and connect directly to the cloud.None of the other options allows all offices to connect to the same single-routed network and thereby connect directly to the cloud. A point-to-point (P2P) allows each office to establish its own connection with the cloud. A client-to-site VPN allows each client to establish its own VPN connection with the cloud, but it requires a separate connection. A site-to-site VPN allows each site or office to establish its own VPN connection with the cloud, but each solution uses a different network.The connection methods used to connect to the cloud include P2P, client-to-site VPN, site-to-site VPN, and MPLS L3 VPN.
Which of the following DNS record types is used for an e-mail server?
MX
Which IoT technology is commonly used in remote controls to transmit information using a form of light?
Many different Internet of Things (IoT) technologies have been and are being introduced. One such technology is used with devices that use Infrared (IR) to relay information with light pulses.
One of your branch offices is located on two non-adjacent floors in an office building. You have been given permission to route a communications link between the two floors using existing conduit in the building's elevator shaft. Your current cabling plan calls for TP wiring on each of the two floors, but the distance between them is more than 90 meters. You need to interconnect the two floors using fiber optic cable in the cheapest manner possible. Which of the following should you deploy between the wiring centers on each floor?
Media convertersYou should deploy media converters between the wiring centers on each floor. By definition, a media converter maintains network characteristics, but permits dissimilar media to be linked together. A pair of media converters that can interlink TP (RJ-45) cables and some kind of standard fiber-optic interface would be a good solution for this scenario. They would permit you to use a single- or multi-mode duplex fiber optic cable to bridge the gap between floors in your office building. Multi-mode makes the most sense here because it is cheaper to purchase and install.
Which of the following specifies a type of fiber optic cable that has a core whose diameter is large enough to transport light arriving at a variety of angles (that is, more than one mode of propagation)?
Multimode fiber (MMF) is a fiber optic cable type whose core has a diameter capable of transporting light arriving at different angles (that is, modes). While this type of cable is typically less expensive to manufacture (as compared to single-mode fiber), the different modes of light propagation can lead to multimode delay distortion and can corrupt data transmissions over long distances.
Which wireless communication protocol requires devices to be within 1.6 inches to communicate?
Near Field Communications (NFC)
Your database administrator needs accurate time-stamping for purchases. Which of the following is would you implement?
Network Time Protocol (NTP) would be implemented to provide accurate time-stamping for purchases. It is used to synchronize the clocks of computers on the network. Synchronization of time is important in areas such as event logs, billing services, e-commerce, banking, and HIPAA Security Rules.
What is a technology that allows a service provider to offer networking services to customers?
Network as a Service (NaaS) is a technology that allows a service provider to offer networking services to customers. As a result, the customers have access to network services without having the ongoing maintenance responsibilities associated with those services.
In a SaaS solution, where are a company's applications hosted?
Offsite
Which of the following is a security implication if your company uses a public cloud deployment?
Other tenants can gain physical access to the resources that store your company's data.
Maps an IP address to a host name
PTR
An eight-port hub receives a signal through port five. That signal is then sent back out through ports one, two, three, four, six, seven, and eight without any signal regeneration. Which type of hub has been described?
Passive hub.A hub is a central point of connection between media segments. There are two primary types of hub: passive and active.A passive hub sends received signals out through all of its ports except the one through which the signal was received. It does not amplify or regenerate the signal. Therefore, it does not require electricity to operate. This type of hub is used mainly to provide communication flow through the network.
Which type of cable might be required for installation in a drop ceiling, which is used as an open-air return duct?
Plenum.Plenum cable is of a special construction for use in the plenum spaces.
Which network appliance is used to restrict clients from accessing certain URLs on the Internet?
Proxy server
Which of the following network appliances acts as a relay for packets traveling between a network's clients and the Internet and is not focused on tunneling?
Proxy server
Which of the following standards specifies a type of coaxial cable typically used for short distance applications, such as carrying composite video between two nearby devices, and has a characteristic impedance of 75 Ohms?
RG-59
Which of the following standards specifies a type of coaxial cable commonly used by local cable companies to connect individual homes to the cable company's distribution network?
RG-6 is commonly used by local cable companies to connect individual homes to a cable company's distribution network. RG-6 cable has a characteristic impedance of 75 Ohms.
Most DHCP client devices on a network are dynamically assigned an IP address from a DHCP server (that is, dynamic addressing). However, some devices (for example, servers) might need to be assigned a specific IP address. What DHCP feature allows a static IP address to MAC address mapping?
Reservation.You can statically configure a DHCP reservation, where a specific MAC address is mapped to a specific IP address that will not be assigned to any other network device.
Your network contains a DHCP server. While performing routine maintenance, you discover that the DHCP server has the following types of options configured: server options, scope options, reserved client options, and class options. Which of these types of options takes precedence?
Reserved client optionsThe reserved client options take precedence over all the other options.The order in which options are applied is as follows:Server optionsScope optionsClass optionsReserved client optionsScope options always override server options if there is a conflict. Class options always override scope and server options. To use class options, DHCP clients must be configured with a specific DHCP Class ID. Reserved client options always override client, scope, and server options.
You need to perform some administrative maintenance on a Cisco router. You decide to connect your notebook computer to the console port on the router. Which type of cable should you use?
Rollover cable. You should use a rollover cable to connect to the console port on any Cisco device. The pin configuration for a rollover cable is easy to remember because of the cable name. The cable pin configuration is "rolled over" so that pin 1 on end 1 matches pin 8 on end 2, pin 2 on end 1 matches pin 7 on end 2, and so on, until a complete reversal is made. In other words, the wires are in reverse order on opposite ends.
The TXT record type contains what records?
SPF and DKIM records
A DHCP server uses a pool of addresses (which typically corresponds to a single subnet) to assign IP address to DHCP clients on a specific network segment. What is a common name for this pool of addresses?
Scope
You have been asked to implement a Voice over Internet Protocol (VoIP) on your company's network. Which protocol should you use?
Session Initiation Protocol (SIP) is the protocol used on a VoIP network. It is an Application layer protocol. VoIP allows you to transmit audio and video messages over a TCP/IP network. Real-time Transport Protocol (RTP) is another protocol used in VoIP. Both SIP and RTP work at the Application layer of the OSI model. Internet Protocol (IP) is used to transmit data over a data network.
Which of the following is a voice over IP (VoIP) signaling protocol used to setup, maintain, and tear down VoIP phone calls?
Session Initiation Protocol (SIP).Session Initiation Protocol (SIP) is a VoIP signaling protocol. However, Real-time Transport Protocol (RTP) is a VoIP protocol that carries voice media (as opposed to signaling). Internet Group Management Protocol (IGMP) is a multicast protocol, and Simple Network Management Protocol (SNMP) is used for monitoring and management of network devices.
Your organization has both UTP and STP cabling available for wiring a new building. What is the main difference in the physical composition of these cables?
Shielding
Automating the management and configuration of many different network devices, thanks to a centralized controller, refers to what technology?
Software-defined networking.SDN is becoming more and more popular today. This permits the centralized control and management of devices throughout the network from a single point. Usually, a graphical user interface provides the administrator interface.
Identify two differences between an Ethernet bridge and an Ethernet switch.
Switches use ASICs to make forwarding decisions, whereas bridges make their forwarding decisions in software.Switches usually have higher port densities than bridges.
Which type of fiber optic connector, containing one fiber optic strand per connector, is connected by pushing the connector into a terminating device and can be removed by pulling the connector from the terminating device?
The SC connector is connected by pushing the connector into the terminating device, and it can be removed by pulling the connector from the terminating device. Unlike a media termination recommended jack (MTRJ) connector, which can be connected and disconnected the same way, an SC connector contains a single fiber strand per connector.
What is the primary difference between the TIA/EIA-568-A and TIA/EIA-568-B wiring standards
The color coding
Which type of fiber optic connector contains two fiber strands in a single connector?
The most unique characteristics of a media termination recommended jack (MTRJ) connector is that two fiber strands (that is, a transmit strand and a receive strand) are included in a single connector. An MTRJ connector is connected by pushing the connector into the terminating device, and it can be removed by pulling the connector from the terminating device.
Which DNS record type includes SPF and DKIM records?
The text (TXT) records contain human-readable text, and are designed to help with fraudulent phishing emails. The Sender Policy Framework (SPF) record within the TXT record helps filter out emails that are spoofed to appear as if they are coming from your domain. SPF looks at the IP address of the last SMTP server and verifies that the IP address and SMTP server match. Domain Keys Identified Mail (DKIM) validates that an email sent from a domain was authorized by the owner of the domain.
What is the main purpose of a VPN concentrator?
To terminate the VPN tunnels
You must propose a cabling scheme for your company's new location. Several departments are located on the same floor with a maximum distance of 61 meters (200 feet) between departments. You want a relatively easy, low-cost installation with simple connections. Which type of cabling would you propose?
Twisted-pair cabling is the least expensive cabling media. Because unshielded twisted-pair (UTP) is commonly used in telephone systems, it is mass-produced, making it inexpensive and widely available. In addition, twisted-pair cabling is very easy to work with, meaning that very little training is required for its installation.
Your company has decided to implement unified communication. You have been asked to implement a VoIP network. You need to connect the VoIP network to your company's PBX. What should you implement?
UC gateway.You should implement a unified communication (UC) gateway to connect the VoIP network to your company's PBX. Unified communications include VoIP, video, real-time services, quality of service (QoS), and UC devices. VoIP allows you to transmit voice communications over an IP network. Real-time services include instant messaging, presence information, voice, mobility features, conferencing services, desktop sharing, data sharing, call control, and speech recognition. Real-time services support both multicast and unicast communications. In unicast, one packet is transmitted to only one destination at a time. On the other hand, multicast sends packets to multiple destinations which is represented by a group address.
Which of the following network appliances performs the most processor-intensive tasks and is critical in IPSec environments?-Content filter-Proxy server-Load balancer-VPN concentrator
VPN concentrator.While several router models can terminate a virtual private network (VPN) circuit, a dedicated device, called a VPN concentrator, could be used instead. A VPN concentrator is designed to perform the processor-intensive processes required to terminate multiple VPN tunnels. For example, running encryption algorithms, such as Advanced Encryption Standard (AES), can be very processor intensive.
What virtual network service stores user data and the GUI in a data center, as opposed to the hard drive in a user's computer?
Virtual Desktop
A location within a building where network cables terminate is commonly called a(n) __________.
Wiring closet
You manage a network for your organization. The network contains one DNS server and three routers. You are setting up a new DHCP server. You configure separate scopes for each subnet on your network. The routers are configured to forward DHCP requests. You need to ensure that DHCP clients receive the appropriate settings using the least administrative effort. What else should you do?
You should configure the DNS server as a server option. This will ensure that all DHCP clients receive the DNS server settings.You should also configure each router as a scope option for its appropriate scope. Each scope will have a different router or default gateway. For this reason, router or default gateway information must be configured at the scope level. If you configure this option at the server level, all the clients would receive the same router configuration, which would not work because you have three different subnets.
What should you implement to isolate two of the devices that are located on a storage area network (SAN) fabric containing eight devices?
You should implement a virtual storage area network (vSAN) to isolate two of the devices that are located on a SAN fabric containing eight devices. A vSAN is a collection of ports from a set of connected Fiber Channel switches that form a virtual fabric. You can partition ports within a single switch into multiple VSANs, despite sharing hardware resources. Do not confuse a vSAN with virtual storage. In recent years, virtual storage solutions like Microsoft's SkyDrive and Amazon's CloudDrive have been developed to provide online storage and sharing of data.
Your company owns a single physical server. You need to ensure that Web services are hosted in a Linux environment while Active Directory services are hosted in a Windows environment. In addition, you need to ensure that these services are hosted on different broadcast domains. What should you do?
You should implement virtual servers and switches. Implementing virtual servers would allow you to host a Linux environment for Web services and a Windows environment for Active Directory services on the same physical server. Implementing virtual switches will allow you to host the services on different broadcast domains.
Which of the following connects to multiple intermediate distribution frames?
main distribution frame (MDF).
Which IoT technology uses electromagnetic fields to identify and track tags attached to items?
radio-frequency identification (RFID)
