Chapter 2 Switching Concepts

Which impact does adding a Layer 2 switch have on a network?

• an increase in the number of dropped frames

• an increase in the size of the broadcast domain

• an increase in the number of network collisions

• an increase in the size of the collision domain

Which characteristic describes cut-through switching?

• Error-free fragments are forwarded, so switching occurs with lower latency.

• Frames are forwarded without any error checking.

• Only outgoing frames are checked for errors.

• Buffering is used to support different Ethernet speeds.

What is the significant difference between a hub and a Layer 2 LAN switch?

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

• A hub divides collision domains, and a switch divides broadcast domains.

• Each port of a hub is a collision domain, and each port of a switch is a broadcast domain.

• A hub forwards frames, and a switch forwards only packets.

Which statement is correct about Ethernet switch frame forwarding decisions?

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

• Cut-through frame forwarding ensures that invalid frames are always dropped.

• Only frames with a broadcast destination address are forwarded out all active switch ports.

• Unicast frames are always forwarded regardless of the destination MAC address.

How do switch buffers affect network performance?

• They provide error checking on the data received.

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

• They provide extra memory for a particular port if autonegotiation of speed or duplex fails.

• They hold data temporarily when a collision occurs until normal data transmission resumes.

Which switch characteristic helps keep traffic local and alleviates network congestion?

• high port density

• fast port speed

• large frame buffers

• fast internal switching

Which switch component reduces the amount of packet handling time inside the switch?

• ASIC

• dual processors

• large buffer size

• store-and-forward RAM

What information is added to the switch table from incoming frames?

• source MAC address and incoming port number

• destination MAC address and incoming port number

• source IP address and incoming port number

• destination IP address and incoming port number

Which switching method ensures that the incoming frame is error-free before forwarding?

• cut-through

• FCS

• fragment free

• store-and-forward

Refer to the exhibit. How many broadcast domains are displayed?

• 1

• 4

• 8

• 16

• 55