Comptia quiz

A network administrator is working for a large company on a subnet that requires an 8 bit mask. Which of the following would that be?

255.0.0.0 is an 8-bit mask. A short netmask (255.0.0.0) allows for millions of hosts per network but only 126 possible network addresses.

A security technician is looking at binary and trying to convert it to an IP address. The first field is 00110011. What does this translate to in decimal?

51

A help desk technician is helping to troubleshoot connectivity issues. Users report that they are receiving a blinking amber light. This is indicative of what type of issue?

A blinking amber light indicates that the system has detected a fault, such as a duplex mismatch or a spanning tree blocking.

A project manager is preparing a team to set up cabling infrastructure in a new building. Which of the following tools should they order to be able to create patch cords?

A cable crimper creates a patch cord that fixes a plug to a cable. The tools are specific to the type of connector and cable, although some have modular dies supporting a range of RJ-type plugs.

A network operator is trying to troubleshoot kinks and imperfections in cabling that could affect performance. What should the network operator use to test the cabling?

A cable tester might incorporate the function of a time domain reflectometer (TDR). A TDR measures the length of a cable run and locates kinks and other imperfections in cables that could affect performance.

A project manager is ordering equipment to set up fiber cabling in a new building. Which of the following tools will allow a more permanent join with lower insertion loss?

A fusion splicer achieves a more permanent join with lower insertion loss (>=0.1 dB). The fusion splicing machine performs a precise alignment between the two strands and then permanently joins them together.

A solutions architect is designing a cable management solution. Which of the following is the most common?

A patch panel or patch bay is a type of distribution block with insulation-displacement connections (IDCs) on one side and pre-terminated RJ-45 modular ports on the other.

A network administrator needs to break up a subnet into subnet masks containing 64 addresses. Which of the following subnet masks should the administrator use?

A subnet mask of 255.255.255.192 has 64 addresses. Subnet addressing has three hierarchical levels: a network ID, subnet ID, and host ID.

A network technician wants to upgrade the company's hub to isolate broadcast domains from each other. Which solution would help the technician to accomplish this but NOT create separate collision domains on each port?

An Ethernet bridge works at the data link layer (layer 2), establishing separate physical network segments while keeping all nodes in the same logical network, reducing the number of collisions.

A network technician wants to upgrade the company's hub to avoid collisions. Which solution would help the technician accomplish this to the fullest extent?

An Ethernet layer 2 switch performs a similar function as a bridge, but in a more granular way, and for many more ports than bridges support. Each switch port is a separate collision domain.

A systems administrator is trying to troubleshoot frames moving over the network medium and wants to set up the most optimal solution. Which of the following should the sysadmin use?

An active tap is a powered device that performs signal regeneration. Gigabit signaling over copper wire is too complex for a passive tap to monitor.

A network technician is trying to troubleshoot attenuation and measure accordingly. What unit of measurement expresses attenuation?

Attenuation is the loss of signal strength, measured in decibels (dB). dB expresses the ratio between two measurements, and in this case, signal strength at origin and destination.

A technician who lays cabling is researching how the manufacturer constructed fiber optic cabling. Which of the following reflects signals back into the waveguide as efficiently as possible so that the light signal travels along the waveguide by multiple internal reflections?

Cladding reflects signals back into the waveguide as efficiently as possible so that the light signal travels along the waveguide by multiple internal reflections.

A network architect is planning a new setup for a new company that has yet to build buildings. Which of the following would the architect set up for a /16 network?

Class B: 255.255.0.0 (/16). The first octet for class B is from 128 - 191. The only remaining use of classful terminology is to describe the default subnet masks.

A network technician needs a cost-effective solution that can multiplex up to 16 wavelengths on an SFP/SFP+ interface. Which multiplexing technique should the network technician use?

Coarse Wavelength Division Multiplexing (CWDM) supports up to 16 wavelengths and typically deploys four or eight bidirectional channels over a single fiber strand.

A new network engineer is deploying an architecture using Carrier Sense Multiple Access with Collision Detection (CSMA/CD). How does the CSMA/CD protocol work?

Data, check network, transmit data, collision, wait, retransmit.

A network technician is troubleshooting a connection from a client and decides to use the bottom to top troubleshooting methodology. Which step would the technician perform first?

Deciding whether the problem is hardware or software-related (i.e., hardware) would be the first step. The physical layer (layer 1) is at the bottom of the OSI model.

A network technician is looking over diagrams for special types of equipment rooms, that mark the point at which external cabling (located outside the plant) joins to internal cabling (located on the premises). What is this called?

Demarcs are special types of equipment rooms marking the point at which external cabling (located outside the plant) joins to the internal cabling (located on the premises).

A server administrator needs to allow a server to instruct the switch to pause traffic temporarily to avoid overwhelming its buffer and causing it to drop frames. What should the server administrator set up?

EEE 802.3x flow control allows a server to instruct the switch to pause traffic temporarily to avoid overwhelming its buffer and causing it to drop frames.

A systems administrator is looking at technology in the organization's environment and finds Fast Link Pulse. What does this technology do?

Fast Ethernet codes a 16-bit data packet into this signal to advertise its service capabilities. This is known as a Fast Link Pulse.

A network administrator is setting up connection points for multiple devices to connect. Which of the following does NOT require any configuration?

Hubs have no configuration options. The technician connects the device to a power source and then connects the network cables for the hosts, becoming part of the network segment served by the hub.

A systems administrator attempts to allow one host on the Internet to send content to other hosts that have identified themselves as interested in receiving the originating host's content. What should the administrator use to accomplish this?

IPv4 multicasting allows one host on the Internet (or private IP network) to send content to other hosts that have identified themselves as interested in receiving the originating host's content.

A company calls a consultant to replace STP cabling and is looking at the varying types. Which of the following is the most difficult to install?

Legacy shielded twisted pair (STP) cable could be complex to install, as it requires bonding each element to ground manually. Using screened or shielded cable means the consultant must also use screened/shielded connectors.

A solutions architect is determining where to use fiber and copper cabling to efficiently and cost-effectively deploy an infrastructure. Which of the following would most likely best suit using the copper cabling?

Many people and businesses are deploying Internet of Things (IoT) devices in their homes and offices, but these are usually wireless or Ethernet-based. Some businesses depend on the underlying embedded systems technology for manufacturing.

A network cabling operator is looking at different fiber optic connector form factors. Which of the following only works for multimod

Mechanical Transfer Registered Jack (MTRJ) is a small-form-factor duplex connector with a snap-in design used for multimode networks.

A systems administrator is setting up servers with standard network interface cards (NICs). Which of the following do most standard NICs support? (Select all that apply.)

Most Ethernet adapters support Gigabit Ethernet, as they are designed for use with copper cabling and are capable of 10/100/1000 operation. Most Ethernet adapters support Fast Ethernet, meaning that they support Gigabit Ethernet, Fast Ethernet, and 10BASE-T.

A network engineer is setting up MTU sizes to follow most Ether products. What is the normal EtherTypes value (in bytes)?

Most Ethernet products follow the original DIX specification, referred to as Type II frames, and use the field to indicate the type of network layer protocol in the frame. These EtherTypes are values of 1536 or greater.

A helpdesk operator is troubleshooting communication issues for devices in different broadcast domains. What do the devices need to pass through to talk to each other?

Nodes within each subnet can address one another directly since they are in the same broadcast domain, but they can only communicate with nodes in other subnets via the router.

A network administrator wants to be able to set up multiple address hosts. Which of the following would accomplish this task? (Select all that apply.)

One method of addressing multiple hosts is to perform a broadcast. An administrator performs a broadcast by sending a packet to the network or subnet's broadcast address. Implemented broadcasts occur at layer 2 by sending them to MAC address ff:ff:ff:ff:ff:ff. All hosts connected to the switch (or in the same VLAN) will receive them.

A systems administrator needs to combine multiple 1 Gbps connections to be able to support 2 Gbps connections. What should the administrator set up?

Port aggregation combines two or more separate cabled links into a single logical channel. From the host end, this is also known as NIC teaming.

A networking administrator is trying to power off a Cisco switch, but it is not working. The administrator needs to be in which mode to perform this task?

Privileged EXEC mode (or enable mode) allows the user to reboot or shut down the appliance and to backup and restore the system configuration.

A systems manager is preplanning for the event that critical servers will fail. Which of the following would be the most likely plan of action?

Replacing, while expensive, is expected for critical servers. Companies often have replacement parts and complete other servers on standby to take over for critical servers.

A networking project manager needs switches that can connect together and operate as a group. Which of the following should the project manager use?

Stackable means that switches can connect together and operate as a group. The sysadmin can manage the switch stack as a single unit.

A helpdesk technician is reviewing the network layout in various areas. What is the purpose of subnetting?

Subnetting creates layer 3 broadcast domain segments with fewer hosts. The trick with subnet design is to fit the scheme to the requirements for a number of subnetworks and hosts per subnet.

A network technician is setting up Cat 7 cabling in the organization's environment. The technician can terminate the cabling with what type of connector? (Select all that apply.

TERA connectors, rather than standard RJ-45 connectors, can terminate Cat 7 cabling. TIA/EIA does not recognize Cat 7 but appears in the cabling standards created by the ISO (ISO/IEC 11801).

A client is trying to connect to a network. The client can get an IP address but does not have internet access and decides to see if they are issued an APIPA address. Which of the following would fall under the APIPA range?

The APIPA range is from 169.254.0.0 through 169.254.255.255. Microsoft developed Automatic Private IP Addressing (APIPA) for clients that could not contact a Dynamic Host Configuration Protocol (DHCP) server.

A security administrator is investigating a CAM table flooded by an attacker. In the packet capture, what protocol should the security administrator filter on to look at related traffic?

The Transmission Control Protocol/Internet Protocol (TCP/IP) suite includes the Address Resolution Protocol (ARP). The ARP performs the task of resolving an IP address to a hardware address. ARP messaging is only available to use with Ethernet.

A network administrator is installing Ethernet cabling connectors following the US government standard and not by which is a more popular choice. Which connector does the network administrator use?

The US government mandates the use of T568A. In T568A, the green pairs wire to pins 1 and 2, and the orange pairs wire to pins 3 and 6.

A security analyst is reviewing malicious packets and trying to understand the IPv4 header. What is the first field in an IPv4 header?

The Version field is the first field in an IPv4 packet and indicates the version of the Internet Protocol in use, which in the case of IPv4 is 4.

A project manager is putting together supplies for a project using fiber optic cabling. The manager is looking at the cabling core ferrule, which has the tightest connection and best return loss performance. Which of the following should the project manager use?

The angled faces of Angled Physical Contacts (APCs) make for an even tighter connection and better return loss performance. APCs cannot mix with PC faces or UPCs.

A help desk operator is trying to identify the vendor for a piece of equipment. What could the help desk operator check to determine the vendor?

The first six hex digits of a MAC address (3 bytes or octets), also known as the Organizationally Unique Identifier (OUI), identifies the manufacturer of the adapter.

A network technician is researching standards for the physical and data link layer. Which standard, developed to implement the functions of the physical and data link layers of the OSI model, is the most important?

The most important standard developed is the Institute of Electrical and Electronics Engineers (IEEE) 802.3 Ethernet standard

A network architect is assessing network performance. Which of the following is part of the CSMA/CD protocol to identify collisions early? (Select all that apply.)

The preamble is for clock synchronization and as part of the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) protocol to identify collisions early. The Start Frame Delimiter (SFD) is also used for clock synchronization and as part of the CSMA/CD protocol to identify collisions early.

A security researcher is looking at traffic directed to 192.0.2.128. What is this used for if used correctly?

The subnets 192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24 are all set aside for use in documentation and examples. These are other IPv4 address ranges reserved for special use and are not publicly routable.

A security analyst is looking at traffic directed to 0.0.0.0/8. What is this used for if used correctly?

The system uses the subnet 0.0.0.0/8 when a specific address is unknown and typically used as a source address by a client seeking a Dynamic Host Configuration Protocol (DHCP) lease

A network technician is laying out coax cables and needs to order more termination connectors. What should the technician order?

The technician usually terminates coax cables using F-type connectors, which the technician secures by screwing into place. Coax cables are categorized using the Radio Grade (RG) standard.

A security architect is dividing a network into logically distinct zones for security and administrative control. Which of the following should the security architect use?

VLANs are useful to divide a network into logically distinct zones for security and administrative control.

A network technician is setting up a connection between switches, but is not establishing a connection. Which of the following would be the most likely cause for it not to work?

When a switch needs to connect to another switch, communications would fail if both interfaces used media dependent interface crossover (MDI-X)

A systems administrator is looking into communications issues on a server. If the destination IPv4 address is on a different IP network or subnet, where will the host send the traffic?

default gateway

A network operator is troubleshooting connectivity issues and suspects the transceiver. What should the network operator perform?

f the problem is not the patch cords, then test the transceivers. The network operator can use a loopback tool to test for a bad port.