S2, L2/3 - Routers and Routing

Question 1

HELLO packets

Answer 1

When a router is booted, it learns about its neighbours by sending HELLO packets. The neighbouring routers then reply with their names

Question 2

ECHO packets (3)

Answer 2

• it is used to determine the delay between routers
• As soon as a router receives an ECHO packet, it immediately sends it back.
• The router that originally sent the ECHO packet will use the round trip time to determine the transmission time. Averaging can be used for more accurate results.