CCNA 3.0 - IP Connectivity

Question 1

Default OSPF hello and dead timers are…

Answer 1

10 and 40 seconds

Question 2

LSAs are automatically reflooded every ____ minutes.

Answer 2

30

Question 3

What is the “All SPF routers” multicast address?

Answer 3

224.0.0.5

Question 4

What is the “All SPF DRs” multicast address?

Answer 4

224.0.0.6

Question 5

Unless manually configured, what will the router choose as its ID?

Answer 5

Highest working loopback IP, followed by highest working interface IP

Question 6

How do the LSDB and the RIB differ?

Answer 6

The LSDB contains all LSAs; the RIB contains the routes calculated from the LSAs in the LSDB.

Question 7

If you change the RID, you must do one of two things:

Answer 7

1) reload
2) clear ip ospf process

Question 8

What are the DR election criteria, in order of precedence?

Answer 8

1) highest interface priority
2) highest router ID

Question 9

What are two ways of configuring passive interfaces?

Answer 9

1) passive-interface (type number)
2) passive-interface default, then no passive-interface (type number)

Question 10

A router can “refuse” to become DR or BDR by using what interface priority setting?

Answer 10

0

Question 11

Mismatched MTU, different network types, or use of priority 0 will give what result?

Answer 11

Routers may become neighbors, but won’t exchange routing information.

Question 12

While it varies by router platform, the common default number of equal-cost routes is…

Answer 12

4

Question 13

What is the default mechanism for load-balancing across multiple equal-cost routes?

Answer 13

per destination address

Question 14

Quick: name three FHRPs.

Answer 14

VRRP
HSRP
GLBP (Global Load Balancing Protocol)

Question 15

What is the IP multicast address used by HSRP and GLBP?

Answer 15

224.0.0.102

Question 16

What is the IP multicast address used by VRRP?

Answer 16

224.0.0.18