Module 3 - Ethernet

Question 1

Describe CSMA/CD

Answer 1

Carrier Sense Multiple Access with Collision Detection
Carrier Sense: Hosts sense the medium and will not start a transmission if the medium is is use
Collision Detection: If a collision is detected, transmission stops and all hosts refrain from transmitting for a random back-off time.

Question 2

What is a Layer-2 Broadcast Domain?

Answer 2

A logical division of a network in which all nodes of that network can be reached at layer 2 by a broadcast (e.g. LAN)

Question 3

What is a collision domain?

Answer 3

A set of LAN devices whos frames could collide with one another.

Question 4

What are the steps for configuring IOM Cards?

Answer 4

show card
configure card 1
card-type “iom3-xp”
admin-state enable

Question 5

What are the steps for configuring an MDA card?

Answer 5

show mda
configure card 1 mda 1
mda-type “m10-1gb-xp-sfp”
admin-state enable

Question 6

What are the steps for configuring a port?

Answer 6

show port
configure port 1/1/1 ethernet
mode [network | access | hybrid]
encap-type [null | do1q | qnq]
mtu 9212
back
admin-state enable

Question 7

What are the cli commands for configuring a LAG?

Answer 7

configure port 1/1/1 ethernet autonegotiate false
configure lag 1
description “<>”
dynamic-cost [true | false]
port-threshold value <> action [down | dynamic-cost | static-cost]

Question 8

When does an Ethernet switch records a MAC address in it’s MAC FDB?

Answer 8

It records the source MAC address and the interface on which it arrived upon receipt of the Ethernet Frame

Question 9

Differentiate between a Collision Domain & a Broadcast Domain

Answer 9

A collision domain is one in which two or more endpoints (hosts or switches) are connected to each other either directly or through one or more hubs.

In a broadcast domain every Ethernet device will receive and process all broadcast packets