day 5

Question 1

RIP next generation (RIPng)

Answer 1

designed specifically for IPv6 networks

sends updates to the IPv6 multicast group FF02::9 using UDP port 521

Question 2

Open shortest path first (OSPF)

Answer 2

supports equal cost load balancing and route authentication.

Question 3

neighbors

Answer 3

routers on a common segment

Question 4

adjacencies

Answer 4

routers connection to a designated router or a backup designated router

Question 5

link state advertisements (LSA’s)

Answer 5

routers exchange LSA’s containing routing and link-state information to form an adjacency

Question 6

Link state database (LSDB)

Answer 6

routers populate with LSA’s received from other routers..

The LSDB is maintained through the exchange of LSA’s

Question 7

show ip ospf neighbor

Answer 7

command for mapping out OSPF connections

Question 8

show ip ospf database

Answer 8

used for understanding the OSPF areas

Question 9

show ip ospf database router

Answer 9

command used to gain a more complete picture of the OSPF network

Question 10

OSPF router roles

Answer 10

Designated router (DR) Backup designated router (BDR)

Question 11

designated router (DR)

Answer 11

sends type 2 LSA to the rest of the network
uses multicast 224.0.0.5 to non DR routers.
OSPF routers use 224.0.0.6 to send traffic back to DR

Question 12

Backup designated router (BDR)

Answer 12

backs up the DR if it fails

Question 13

OSPF router types

Answer 13

Backbone router, internal router, area border router, autonomous system boundry router

Question 14

Backbone router

Answer 14

router with at least one interface attached to area 0

Question 15

internal router

Answer 15

routers whose interfaces all belong to the same OSPF area

Question 16

Area border router (ABR)

Answer 16

routers connected to more than one area

Question 17

Autonomous system boundry router (ASBR)

Answer 17

routers that inject external LSA’s into the OSPF database

Question 18

link state advertisements (LSA’s)

Answer 18

advertisements about itself and its links to all other routers in the network

Question 19

1- router LSA

Answer 19

produced by every router and includes links, interfaces, state of links, and costs.

sent to the DR and BDR

Question 20

2- network LSA

Answer 20

DR collects type 1 LSA’s and sends out a single type 2 representing all the routers on the link

Question 21

3- summary LSA

Answer 21

ABR’s send one LSA representing Type 1 and Type 2 LSA’s in an area

Question 22

4- ASBR Summary LSA

Answer 22

Originated by area border routers. sent to other areas to build the shortest path tree to an ASBR

Question 23

5-AS External LSA

Answer 23

Originated by ASBR’s. advertises destinations external to the OSPF autonomous system. Flooded throughout the OSPF AS

Question 24

7-NSSA External LSA

Answer 24

not flooded througout the OSPF autonomous system

Question 25

standard area

Answer 25

Area 0 is a standard area.

Can contain LSA’s of type 1, 2, 3, 4, 5

Question 26

Stub area

Answer 26

prevents type 5 LSA

contain type 1, 2, 3 LSA’s

Question 27

totally stubby area

Answer 27

prevents type 5 and 3 LSA’s

only contain type 1 and 2 LSA’s

Question 28

not-so-stubby-area (NSSA)

Answer 28

allows type 7 (NSSA external)

Question 29

transit area

Answer 29

consists of a virtual link between areas