Chapter 5 Analyzing Ethernet LAN Switching

Question 1

What is a broadcast frame.

Answer 1

An Ethernet Frame sent to a destination address FFFF.FFFF.FFFF , meaning that the frame should be delivered to all hosts on the LAN

Question 2

Known unicast frame

Answer 2

And ethernet frame who’s destination Mac address is listed in a switches Mac address table, so the switch will forward that frame out the one port associated with the entry and that Mac address table

Question 3

STP

Answer 3

Spanning tree protocol. A protocol defined by IEEE standard 802.ID . Allow switches and bridges to create a redundant LAN with the protocol dynamically causing some ports to block traffic, so that the bridge / switch forwarding logic will not cause frames to loop indefinitely around the LAN.

Question 4

Unknown unicast frame

Answer 4

and ethernet frame whose destination Mac address is not listed in a switches Mac address table, so the switch must flood the frame

Question 5

Mac address table

Answer 5

A table of forwarding information held by a layer to switch, built dynamically by listening to incoming frames and used by the switch to match frames to make decisions about where to forward the frame

Question 6

What is flooding and forwarding in regards to switches

Answer 6

Forwarding is regarding sending a frame received in one interface out another interface, towards his ultimate destination.

flooding is the result of the land switch forwarding process for broadcast and unknown unicast frames. Switches for these frames out all interfaces, except the interface in which the frame arrived. Switches also fled multicass by default, although this behavior can be changed.

Question 7

CLI

Show mac address-table

Answer 7

Shows all Mac table entries of all types

Question 8

CLI

Show mac address-table dynamic

Answer 8

Shows all dynamic we learned Mac table entries

Question 9

CLI

Show mac address-table count

Answer 9

Shows the number of entries in a Mac table and a total number of remaining empty slots in the Mac table

Question 10

Show mac address-table aging-time

Answer 10

Shows the global and per VLAN aging time out for inactive mac table entries

Question 11

CAM

Answer 11

Content addressable memory. This is the type of memory used to store a mac address table.

Question 12

Switches build incoming frames by listening to what address.

Answer 12

Source Mac address

Question 13

When a switch receives a frame and there is no matching entry into it’s mac table, the switch forwards that frame out of all interfaces except what .

Answer 13

The incoming interface.

Question 14

What is the broadcast address

Answer 14

FFFF.FFFF.FFFF