What advantage of OSPF ?

Question

A significant advantage of OSPF is that it allows routing updates messages between routers to be:

a- saved

b- authenticated

c- backed up

d- invisible    

e- None of the above

Answer 1

Looking at the options the only one that seems to apply in any way to me is "authenticated"

OSPF supports 3 types of authentication

1) Null (no authenticaiton)

2) Simple password (unencrypted)

First setup simple authentication in the ospf area

router ospf 10

area 0 authentication

Second setup the md5 key for each interface in the area

interface Ethernet1/1

ip ospf authentication-key T3st123

interface Ethernet1/2

ip ospf authentication-key T3st456

3) MD5 (most secure)

First setup md5 authentication in the ospf area

router ospf 10

area 0 authentication message-digest

Second setup the md5 key for each interface in the area

interface Ethernet1/1

ip ospf message-digest-key 1 md5 Test123

!

interface Ethernet1/2

ip ospf message-digest-key 1 md5 Test456

Answer 2

According to wikipedia.....

https://en.wikipedia.org/wiki/Open_Shortest_Path_First

--------------

As a link-state routing protocol, OSPF establishes and maintains neighbor relationships for exchanging routing updates with other routers. The neighbor relationship table is called an adjacency database. 

--------------

Based on that definition which answer do you think is the best......

A significant advantage of OSPF is that it allows routing updates messages between routers to be:

a- saved

b- authenticated

c- backed up

d- invisible    

e- None of the above