Ethernet

Question 1

How many collision domains does a switch have?

Answer 1

The same amount of ports a switch has

Question 2

How many broadcast domains does a switch have

Answer 2

1

Question 3

How many broadcast domains does a router have?

Answer 3

Each port is a broadcast domain

Question 4

According to the IEEE 802.3 Ethernet specification. what does half duplex ports use

Answer 4

CSMA/CD or Carrier Sense Multiple Access with Collision Detection. It helps prevent collisions and to permit retransmitting if one occurs

Question 5

If a hub is attached to the switch, will the connection be half or full duplex

Answer 5

Half duplex because the hub can only do half duplex.

Question 6

How to tell is you are having a duplex issue

Answer 6

Switch#sh int f0/1
If input error and late collision is increasing, you have duplex issue.
If there was broadcast storm, the “no buffers” and “ignored” stats would increase

Question 7

How many bits are in MAC address

Answer 7

48 bits. 6 groups, each has 1 byte. First 24 bits are the Organizational Unique Identifier(OUI)

Question 8

What is encapsulation

Answer 8

Wraps the data by the head by a label (that has additional data)
Protocol Data Unit: A name for each layer

Question 9

What is Cisco Three-Layer Model

Answer 9

Core: Connectivity between distribution layers for large LAN environments. High speed backbone with no packet manipulation
Distribution: Connectivity to services, Routing and packet manipulation, Access Lists, Scalability
Access: Provides endpoints, Device connectivity, Port Security, but not access control lists (ACLs)

Question 10

When to use crossover cable

Answer 10

Between 2 of any like devices
Switch-Switch
Switch-Hub
Hub-Hub
Router-Router
Router-PC
PC-PC

Question 11

When to use Straight-Through Cables

Answer 11

Switch-Router
Switch-PC
Switch-Server
Hub-PC
Hub-Server