Chapter 3: Fundamentals Of WANS And IP Routing

Question 1

What is HDLC? What layer is it?

Answer 1

High-Level Data Link Control / Layer 2

Question 2

What field does HDLC contain on Cisco routers? What is it’s purpose?

Answer 2

Type / Identified type of Layer 3 packet within the frame

Question 3

What protocol does EoMPLS use for layer 1 and 2 functions?

Answer 3

Ethernet

Question 4

How many bytes is an IP header?

Answer 4

20

Question 5

150.150.1.10 wants to send data to 150.150.4.10. What is the first step which undertaken?

Answer 5

Sends the packet to the default gateway as destination IP is not on the same subnet

Question 6

Router 150.150.4.1 receives a frame from 150.150.1.10 with a destination of 150.150.4.10. What does the router do with the frame?

Answer 6

Encapsulate it inside a new Ethernet header and trailer and forward frame to target node on the same LAN

Question 7

What does a router add to it’s routing table by default?

Answer 7

A route for all connected subnets

Question 8

What does a router do when a new route is discovered from a neighbour?

Answer 8

Add it to it’s routing table with the next hop as the node from which the route was discovered