Chapter 14


"Do I Know This Already?"

1.

d

2.

d

3.

c

4.

b

5.

b

6.

b

7.

c

8.

c

9.

c

10.

b

11.

b

12.

c

Q&A

1.

A multilayer switch has been configured with the command standby 5 priority 120. What router-redundancy protocol is being used?

Answer:

HSRP

2.

What feature can you use to prevent other routers from accidentally participating in an HSRP group?

Answer:

HSRP authentication

3.

What command can configure an HSRP group to use a virtual router address of 192.168.222.100?

Answer:

standby 1 ip 192.168.222.100

4.

The show standby vlan 271 command produces the following output:

Vlan271 - Group 1   Local state is Active, priority 210, may preempt   Hellotime 3 holdtime 40 configured hellotime 3 sec holdtime 40 sec   Next hello sent in 00:00:00.594   Virtual IP address is 192.168.111.1 configured     Secondary virtual IP address 10.1.111.1     Secondary virtual IP address 172.21.111.1   Active router is local   Standby router is unknown expires in 00:00:37   Standby virtual mac address is 0000.0c07.ac01   2 state changes, last state change 5d17h

If the local router fails, which router takes over the active role for the virtual router address 192.168.111.1?

Answer:

None. There is no known standby router, so it also has failed.

5.

What is meant by pre-empting in HSRP?

Answer:

Normally, if the active router (highest priority) fails, another router takes over its active role. The original active router is not allowed to resume the active role when it is restored until the new active router fails. Pre-empting allows a higher-priority router to take over the active role immediately or after a configurable delay.

6.

What protocols discussed in this chapter support interface tracking?

Answer:

HSRP, GLBP

7.

The show standby brief command has been used to check the status of all HSRP groups on the local router. The output from this command is as follows:

Switch# show standby brief                      P indicates configured to preempt.                      | Interface  Grp  Prio P State   Active addr     Standby addr     Group addr Vl100      1    210  P Active  local           192.168.75.2     192.168.75.1 Vl101      1    210  P Active  local           192.168.107.2    192.168.107.1 Vl102      1    210  P Active  local           192.168.71.2     192.168.71.1

Each interface is shown to have Group 1. Is this a problem?

Answer:

No, as long as there is no bridging between VLANs. The HSRP group number can be repeated because each group is isolated on its own VLAN.

8.

How many HSRP groups are needed to load-balance traffic over two routers?

Answer:

Two

9.

What load-balancing methods can GLBP use?

Answer:

Round robin, weighted, host dependent

10.

What command can you use to see the status of the active and standby routers on the VLAN 171 interface?

Answer:

show standby vlan 171

11.

How many GLBP groups are needed to load-balance traffic over four routers?

Answer:

One

12.

To use NSF on a multilayer switch with redundant supervisor modules, what must be configured in addition to the redundancy mode? What else must be present in the network?

Answer:

First, the SSO redundancy mode must be enabled with the redundancy and mode sso configuration commands. NSF can be enabled only when it is configured within the respective routing protocol configurations. When NSF is configured on a switch, there must be other neighboring switches or routers that are NSF-aware. The local switch depends on these devices to provide it with routing information during a failover.

13.

How is SSO different from SRM with SSO redundancy mode?

Answer:

There is no difference. SRM refers to Single Router Mode, in which only one of the two route processors can be active at any time. Only one route processor can be active for the Stateful Switchover (SSO) mode, so SRM is used inherently with SSO.

14.

If two Catalyst 6500 power supplies are configured with the power redundancy-mode combined, what will happen if one of them fails?

Answer:

In combined mode, both power supplies actively share the total power load of the chassis. As long as the total power budget is less than the maximum capacity of one power supply, the one working power supply can continue to power the switch. Otherwise, the supervisor will begin removing power from switch modules until the power load becomes less than the power supply capacity.



CCNP Self-Study(c) CCNP BCMSN Exam Certification Guide
Red Hat Fedora 5 Unleashed
ISBN: N/A
EAN: 2147483647
Year: 2003
Pages: 177

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