Lesson 5 - Terms

Question 1

What is forwarding (or switching) function

Answer 1

Router’s action to transfer a packet from an input link interface to the appropriate output link interface

Question 2

What is a control plane

Answer 2

Software part of the router that is for routing management; implement routing protocols, maintain routing tables, compute forwarding tables

Question 3

What is a data plane

Answer 3

Hardware part of the router that is for the forwarding

Question 4

What is switching fabric

Answer 4

Moves the packets from input to output ports; three types: memory, bus, crossbar

Question 5

What is FIB

Answer 5

Forwarding Information Base, mapping between destination prefix and output links

Question 6

What is header validation and checksum

Answer 6

Checking packet’s version number, decrements the time-to-live, and recalculates the header checksum

Question 7

What is route processing

Answer 7

Building forwarding tables using routing protocols such as RIP, OSPF, and BGP

Question 8

What is SNMP

Answer 8

Simple Network Management Protocol, provides a set of counters for remote inspection

Question 9

What is ICMP

Answer 9

Internet Control Message Protocol, sending error messages e.g. when time-to-live is exceeded

Question 10

What is CIDR

Answer 10

Classless Internet Domain Routing, essentially assigns IP addresses using arbitrary-length prefixes to decrease router table size, but created the problem of longest-prefix matching