Final Exam

What is characteristic of the CSMA/CD process?

A device listens and waits until the media is not busy before transmitting.

What is characteristic of the CSMA/CD process?

After detecting a collision, hosts can attempt to resume transmission after a random time delay has expired.

Which statement describes how to assess traffic flow patterns and network traffic types using a protocol analyzer?

Perform the capture on different network segments.

What are two characteristics shared by TCP and UDP?

Port numbering and use of checksum.

What are proprietary protocols?

Protocols developed by organizations who have control over their definition and operation.

What is a function of the data link layer?

Provides for the exchange of frames over a common local media.

An employee of a large corporation remotely logs into the company using the appropriate username and password. The employee is attending an important video conference with a customer concerning a large sale. It is important for the video quality to be excellent during the meeting. The employee is unaware that after a successful login, the connection to the company ISP failed. The secondary connection, however, activated within seconds. The disruption was not noticed by the employee or other employees.What three network characteristics are described in this scenario?

Quality of service, fault tolerance, and security.

Refer to the exhibit. Which two network addresses can be assigned to the network containing 10 hosts? Your answers should waste the fewest addresses, not reuse addresses that are already assigned, and stay within the 10.18.10.0/24 range of addresses.

10.18.10.208/28, and 10.18.10.224/28

Which subnet would include the address 192.168.1.96 as a usable host address?

192.168.1.64/26

What would be the interface ID of an IPv6 enabled interface with a MAC address of 1C-6F-65-C2-BD-F8 when the interface ID is generated by using the EUI-64 process?

1E6F:65FF:FEC2:BDF8

Refer to the exhibit. A network engineer has been given the network address of 192.168.99.0 and a subnet mask of 255.255.255.192 to subnet across the four networks shown. How many total host addresses are unused across all four subnets?

200.

A network administrator is adding a new LAN to a branch office. The new LAN must support 200 connected devices. What is the smallest network mask that the network administrator can use for the new network?

255.255.255.0

A network administrator is adding a new LAN to a branch office. The new LAN must support 61 connected devices. What is the smallest network mask that the network administrator can use for the new network?

255.255.255.192

192.0.2.123 =

A TEST-NET address.

169.254.1.5 =

A link-local address.

127.0.0.1 =

A loopback address.

172.19.20.5 =

A private address.

Which scenario describes a function provided by the transport layer?

A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window.

What are two primary responsibilities of the Ethernet MAC sublayer?

Accessing the media and data encapsulation.

An IPv6 enabled device sends a data packet with the destination address of FF02::2. What is the target of this packet?​

All IPv6 configured routers on the local link​.

What is characteristic of the CSMA/CD process?

All of the devices on a segment see data that passes on the network medium.

Store-and-forward:

Always stores the entire frame, checks the CRC before forwarding, and checks the frame length before forwarding

240.2.6.255 =

An experimental address.

Which three layers of the OSI model map to the application layer of the TCP/IP model?

Application, presentation, and session.

Three bank employees are using the corporate network. The first employee uses a web browser to view a company web page in order to read some announcements. The second employee accesses the corporate database to perform some financial transactions. The third employee participates in an important live audio conference with other corporate managers in branch offices. If QoS is implemented on this network, what will be the priorities from highest to lowest of the different data types?

Audio conference, financial transactions, and web page.

MAC address:

Contained in the Layer 2 header, separated into OUI and a unique identifier, and is 48 bits.

IP address:

Contained in the Layer 3 header, seperated into a network portion and a unique identifier, and is 32 or 128 bits.

Which type of server relies on record types such as A, NS, AAAA, and MX in order to provide services?

DNS.

Which statement is correct about MAC and IP addresses during data transmission if NAT is not involved?

Destination IP addresses in a packet header remain constant along the entire path to a target host.

Which statement is correct about MAC and IP addresses during data transmission if NAT is not involved?

Destination and source MAC addresses have local significance and change every time a frame goes from one LAN to another.

What is a characteristic of IP?

Does not require a dedicated end-to-end connection.

A new network administrator has been asked to enter a banner message on a Cisco device. What is the fastest way a network administrator could test whether the banner is properly configured?

Exit privileged EXEC mode and press Enter.

Refer to the exhibit. The IP address of which device interface should be used as the default gateway setting of host H1?

G0/0

Cut-through:

Has low latency, may forward runt frames, and begins forwarding when the destination address is received

Refer to the exhibit. The network administrator has assigned the LAN of LBMISS an address range of 192.168.10.0. This address range has been subnetted using a /29 prefix. In order to accommodate a new building, the technician has decided to use the fifth subnet for configuring the new network (subnet zero is the first subnet). By company policies, the router interface is always assigned the first usable host address and the workgroup server is given the last usable host address. Which configuration should be entered into the properties of the workgroup server to allow connectivity to the Internet?

IP address: 192.168.10.38 subnet mask: 255.255.255.248, default gateway: 192.168.10.33

What two pieces of information are displayed in the output of the show ip interface brief command

IP addresses and Layer 1 statuses.

What is a feature of ARP?

If a device receiving an ARP request has the destination IPv4 address, it responds with an ARP reply.

What is a feature of ARP?

If a host is ready to send a packet to a local destination device and it has the IP address but not the MAC address of the destination, it generates an ARP broadcast.

Which function is performed at the MAC sublayer of the OSI Data Link Layer to facilitate Ethernet communication?

Implements CSMA/CD over legacy shared half-duplex media.

Which function is performed at the MAC sublayer of the OSI Data Link Layer to facilitate Ethernet communication?

Integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper.

Which layer of the TCP/IP model provides a route to forward messages through an internetwork?

Internet.

What mechanism is used by a router to prevent a received IPv4 packet from traveling endlessly on a network?

It decrements the value of the TTL field by 1 and if the result is 0, it discards the packet and sends a Time Exceeded message to the source host.

What is one main characteristic of the data link layer?

It shields the upper layer protocol from being aware of the physical medium to be used in the communication.

A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in the ARP cache. How will the device obtain a destination MAC address?

It will send an ARP request for the MAC address of the default gateway.

Refer to the exhibit. Host B on subnet Teachers transmits a packet to host D on subnet Students. Which Layer 2 and Layer 3 addresses are contained in the PDUs that are transmitted from host B to the router?

Layer 2 destination address = 00-00-0c-94-36-ab Layer 2 source address = 00-00-0c-94-36-bb Layer 3 destination address = 172.16.20.200 Layer 3 source address = 172.16.10.200

What does the term "attenuation" mean in data communication?

Loss of signal strength as distance increases.

What three requirements are defined by the protocols used in network communications to allow message transmission across a network?

Message encoding, delivery options, and message size.

What is an advantage for small organizations of adopting IMAP instead of POP?

Messages are kept in the mail servers until they are manually deleted from the email client.

What is a characteristic of IP?

Operates independently of the network media.

Refer to the exhibit. PC1 issues an ARP request because it needs to send a packet to PC2. In this scenario, what will happen next?​

PC2 will send an ARP reply with its MAC address.

Which two protocols operate at the top layer of the TCP/IP protocol suite?

POP and DNS.

Refer to the exhibit. If PC1 is sending a packet to PC2 and routing has been configured between the two routers, what will R1 do with the Ethernet frame header attached by PC1?

Remove the Ethernet header and configure a new Layer 2 header before sending it out S0/0/0.

What are two ICMPv6 messages that are not present in ICMP for IPv4?

Router Advertisement and Neighbor Solicitation.

A network administrator is designing the layout of a new wireless network. Which three areas of concern should be accounted for when building a wireless network?

Security, interference, coverage area.

What is the consequence of configuring a router with the ipv6 unicast-routing global configuration command?​

The IPv6 enabled router interfaces begin sending ICMPv6 Router Advertisement messages.

Which statement is correct in comparison of IPv4 and IPv6 packet headers?

The Source Address field name from IPv4 is kept in IPv6.

Which statement is correct in comparison of IPv4 and IPv6 packet headers?

The Time-to-Live field from IPv4 has been replaced by the Hop Limit field in IPv6.

An administrator is trying to configure the switch

The administrator must first enter privileged EXEC mode before issuing the command.

Refer to the exhibit. What three facts can be determined from the viewable output of the show ip interface brief command?

The default SVI has been configured, the switch can be remotely managed, and one device is attached to a physical interface.

What will happen if the default gateway address is incorrectly configured on a host?

The host cannot communicate with hosts in other networks

Refer to the exhibit. On the basis of the output, which statement about network connectivity are correct?

There are 4 hops between this device and the device at 192.168.100.1.

Refer to the exhibit. On the basis of the output, which statement about network connectivity are correct?

There is connectivity between this device and the device at 192.168.100.1

Global routing prefix:

This network portion of the address is assigned by the provider.

Interface ID:

This part of the address is the equivalent to the host portion of an IPv4 address.

Subnet ID:

This part of the address is used by an organization to identify subnets.

Which value, that is contained in an IPv4 header field, is decremented by each router that receives a packet?

Time-to-Live.

Why would a Layer 2 switch need an IP address?

To enable the switch to be managed remotely.

What is the purpose of the TCP sliding window?

To request that a source decrease the rate at which it transmits data.

Which type of security threat would be responsible if a spreadsheet add-on disables the local software firewall?

Trojan horse.

Which two traffic types use the Real-Time Transport Protocol (RTP)?

Video and voice.

Users report that the network access is slow. After questioning the employees, the network administrator learned that one employee downloaded a third-party scanning program for the printer. What type of malware might be introduced that causes slow performance of the network?

Worm.

What command can be used on a Windows PC to see the IP configuration of that computer?

ipconfig

Which two commands can be used on a Windows host to display the routing table?

route print and netstat -r

A company has a file server that shares a folder named Public. The network security policy specifies that the Public folder is assigned Read-Only rights to anyone who can log into the server while the Edit rights are assigned only to the network admin group. Which component is addressed in the AAA network service framework?

Authorization.

Which statement describes how to assess traffic flow patterns and network traffic types using a protocol analyzer?

Capture traffic during peak utilization times to get a good representation of the different traffic types.

What are two common causes of signal degradation when using UTP cabling?

Low-quality cables or connectors and improper signal degradation.

What attribute of a NIC would place it at the data link layer of the OSI model?

MAC address.

What characteristic describes a Trojan horse?

Malicious software or code running on an end device.

What are three commonly followed standards for constructing and installing cabling?

Pinouts, cable lengths, and connector types.

What is the consequence of configuring a router with the ipv6 unicast-routing global configuration command?

The IPv6 enabled router interfaces begin sending ICMPv6 Router Advertisement messages.