Routing

Question 1

Split Horizon

Answer 1

Prevents a route learned on one interface from being advertised back out of that same interface

Question 2

Posion Reverse

Answer 2

Causes a route received on one interface to be advertised back out of that same interface with a metric considered to be infinite

Question 3

AS

Answer 3

Autonomous System

Question 4

IGP

Answer 4

Interior Gateway Protocols (IGP)

Operate within an autonomous system ▪ Exterior Gateway Protocols (EGP)

Question 5

EGP

Answer 5

Exterior Gateway Protocols

Operated between autonomous systems

Question 6

Distance Vector

Answer 6

Based on number of “hops”

• RIP
• RIPv2
• EIGRP (Cisco)

Question 7

Link State

Answer 7

Based on quality of connection/speed

• OSPF
• IS-IS

Question 8

IGMP

Answer 8

Internet Group Management Protocol

▪ Used by clients and routers to let routers known which interfaces have multicast receivers
▪ Used by clients to join a multicast group

Question 9

PIM

Answer 9

Protocol Independent Multicast (PIM)
o Routes multicast traffic between multicast-enabled routers
o Multicast routing protocol forms a multicast distribution tree

Question 10

PIM-DM

Answer 10

PIM Dense Mode (PIM-DM)

● Uses periodic flood and prune behavior to form optimal distribution tree

● Causes a negative performance impact on the network

● Rarely used in modern networks

Question 11

PIM-SM

Answer 11

PIM Sparse Mode (PIM-SM)

● Initially uses a shared distribution tree, which may be suboptimal, but…

● Eventually creates an optimal distribution tree through shortest path tree (SPT) switchover

Question 12

AD

Answer 12

Administrative Distance

Directly Connected     0
Statically Configured   1
RIP
ISIS
OSPF