Module 2 Exam

What does the switch use to build its MAC address table? Source MAC Address Source IP Address Destination MAC Address Destination IP address

Source MAC Address

What information is added to the switch table from incoming frames? Destination MAC address and incoming port number Destination IP address and incoming port number Source MAC address and incoming port number Source IP address and incoming port number

Source MAC address and incoming port number

Which switching method ensures that the incoming frame is error-free before forwarding? Store-and-forward FCS Fragment free Cut-through

Store-and-forward

Which network device can be used to eliminate collisions on an Ethernet network? Firewall Switch Router Hub

Switch

What does the term "port density" represent for an Ethernet switch? The speed of each port The memory space that is allocated to each switch port The number of hosts that are connected to each switch port The number of available ports

The number of available ports

How do switch buffers affect network performance? They provide error checking on the data received. They hold data temporarily when a collision occurs until normal data transmission resumes. They provide extra memory for a particular port if autonegotiation of speed or duplex fails. They store frames received, thus preventing premature frame discarding when network congestion occurs.

They store frames received, thus preventing premature frame discarding when network congestion occurs.

Refer to the exhibit. How many broadcast domains are displayed? 8 4 16 1 55

8

What is the significant difference between a hub and a Layer 2 LAN switch? A hub forwards frames, and a switch forwards only packets. Each port of a hub is a collision domain, and each port of a switch is a broadcast domain. A hub extends a collision domain, and a switch divides collision domains. A hub divides collision domains, and a switch divides broadcast domains.

A hub extends a collision domain, and a switch divides collision domains.

Which switch component reduces the amount of packet handling time inside the switch? Large buffer size ASIC Store-and-forward RAM Dual processors

ASIC

Which impact does adding a Layer 2 switch have on a network? An increase in the size of the collision domain An increase in the size of the broadcast domain An increase in the number of network collisions An increase in the number of dropped frames

An increase in the size of the broadcast domain

Where is the switch table stored? ROM CAM NVRAM Flash

CAM

What is one function of a Layer 2 switch? Duplicates the electrical signal of each frame to every port Forwards data based on logical addressing Learns the port assigned to a host by examining the destination MAC address Determines which interface is used to forward a frame based on the destination MAC address

Determines which interface is used to forward a frame based on the destination MAC address

What value does a switch use to check for errors in a frame? FCS Frame header length VLAN ID Packet header length

FCS

Which characteristic of a switch does NOT alleviate network congestion? Large Frame Buffers Fast boot environment Fast Internal Switching High Port Density Fast port speeds

Fast boot environment

What will a Cisco LAN switch do if it receives an incoming frame and the destination MAC address is not listed in the MAC address table? Use ARP to resolve the port that is related to the frame. Drop the frame. Forward the frame out all ports except for the port where the frame is received. Send the frame to the default gateway.

Forward the frame out all ports except for the port where the frame is received.

What type of switching method examines the first 64-bytes of a frame to make sure no fragmentation has occurred? Store-and-process Fragment-free Rapid frame-forwarding Store-and-Forward

Fragment-free

Which switch characteristic helps alleviate network congestion when a 10 Gbps port is forwarding data to a 1 Gbps port? Frame buffering High port density Fast internal switching Fast port speed

Frame buffering

Which statement is correct about Ethernet switch frame forwarding decisions? Unicast frames are always forwarded regardless of the destination MAC address. Only frames with a broadcast destination address are forwarded out all active switch ports. Cut-through frame forwarding ensures that invalid frames are always dropped. Frame forwarding decisions are based on MAC address and port mappings in the CAM table.

Frame forwarding decisions are based on MAC address and port mappings in the CAM table.

Which characteristic describes cut-through switching? Buffering is used to support different Ethernet speeds. Frames are forwarded without any error checking. Error-free fragments are forwarded, so switching occurs with lower latency. Only outgoing frames are checked for errors.

Frames are forwarded without any error checking.

Which switch characteristic helps keep traffic local and alleviates network congestion? Fast port speed High port density Large frame buffers Fast internal switching

High port density

Refer to the exhibit. A switch receives a Layer 2 frame that contains a source MAC address of 000b.a023.c501 and a destination MAC address of 0050.0fae.75aa. Place the switch steps in the order they occur. (Not all options are used.) Occurs First >>> Occurs Second >>> Because the source MAC address is not known, the switch broadcasts the frame out all ports except the port through which the frame arrived. The switch adds the destination MAC address to the MAC address table. The switch drops the frame. The switch adds the source MAC address to the MAC address table. Because the destination is not known, the switch forwards the frame out all ports except the port which the

Occurs First >>> The switch adds the source MAC address to the MAC address table. Occurs Second >>> Because the destination is not known, the switch forwards the frame out all ports except the port which the

Which network device can serve as a boundary to divide a Layer 2 broadcast domain? Router Access point Ethernet bridge Ethernet hub

Router