OSPF

Question 1

What kind of packets are used during the Loading phase?

Answer 1

LSU

Question 2

What does an LSU contain?

Answer 2

One or several LSA’s

Question 3

What information is in a Network LSA?

Answer 3

the DR on a broadcast segment lists which routers are joined together by the segment. The LSID of the type 2 LSA is the IP interface address of the DR.

Question 4

What information is in a Summary LSA?

Answer 4

Information about subnets in other areasSubnet ID, mask,RID of ABR that advertises the LSA

Question 5

In what OSPF phase do neighbors pass each other their LSA’s?

Answer 5

Loading

Question 6

What are the 2 primary timers in OSPF?

Answer 6

Hello

Dead Interval

Question 7

For DROthers, what is the maximum state that they reach with each other?

Answer 7

2way

Question 8

List the first 3 OSPF LSAs

Answer 8

Router
Network
Summary

Question 9

Command to passive an OSPFv3 interface

Answer 9

conf t
ipv6 router ospf PID
passive-interface interface

Question 10

What is the all-OSPF IPv6 address?

Answer 10

FF02::5

Question 11

What is the all-DR IPv6 address?

Answer 11

FF02::6

Question 12

In OSPFv3, how does one include an interface in routing?

Answer 12

by enabling routing directly on the interface, not via the network command

Question 13

Generic syntax to add an interface into OSPFv3

Answer 13

conf t
interface interface
ipv6 ospf PID area Area ID

Question 14

Syntax to enable OSPFv3 on int gi1/0, in area 0
ipv6 router ospf 12
router-id 1.2.3.4

Answer 14

conf t
int gi1/0
ipv6 ospf 12 area 0

Question 15

Command to tell a router to not form OSPF adjacencies on a given interface

Answer 15

conf t
router ospf PID
passive-interface interface name

Question 16

What 5 attributes must match for OSPF neighbors to become adjacent?

Answer 16

1. Same subnet
2. Hold/dead timers
3. Authentication
4. Same area
5. Same interface MTU

Question 17

Command to configure a router-id for an OSPFv3 router

Answer 17

conf t
ipv6 router ospf PID
router-id IPv4 RID