OSPF Security

Question 1

Usage of Routing Protocols (mcq)

Answer 1

• To communicate with each other
• To determine best path to the destination
• To make dynamic adjustments to its conditions
• You can enable authentication in OSPF in order to exchange routing update information in a secure manner.

Question 2

Simple Password Authentication (mcq)

Answer 2

Plain text authentication passwords do not have to be the same
throughout an area, but they must be the same between neighbours

Question 3

Simple Password Authentication statement

Answer 3

R1(config-if)# ip ospf authentication
R1(config-router)# area 0 authentication
R1(config-if)# ip ospf authentication-key Cisco123

Question 4

MD5 Password Authentication (prob not)

Answer 4

Provides higher security than plain text authentication

Hash value is transmitted in the packet, along with a key ID and a
non-decreasing sequence number receiver calculates its own hash value.
If nothing in the message changes, the hash value of the
receiver should match the hash value of the sender which is
transmitted with the message
Ensuring that packets are processed in the correct order.

Question 5

MD5 Password Authentication statement

Answer 5

R1(config-if)# ip ospf authentication message-digest
R1(config-rouer)# area 0 authentication message-digest
R1(config-if)# ip ospf message-digest-key 1 md5
Cisco123

Question 6

When is Simple Password Authentication (mcq) used

Answer 6

Used when devices within an area cannot support the more secure MD5 authentication