Review Questions Chp 15

Question 1

Which of the following would you use to find the VLANs for which your switch is the root bridge?

Answer 1

show spanning-tree

show spanning-tree summary

Question 2

You want to run the new 802.1w on your switches. Which of the following would enable this protocol

Answer 2

Switch(config)#spanning-tree mode rapid-pvst

Question 3

Which of the followingis a layer 2 protocol used to maintain a loop-free network

Answer 3

STP

Question 4

Which statement describes a spanning-tree network that has converged?

Answer 4

All switch and bridge ports are in either the forwarding or blocking state

Question 5

Which of the following modes enable LACP EtherChannel

Answer 5

Active or Passive

Question 6

What does BPDU Guard perform

Answer 6

Shuts down a port if a BPDU is seen on the port

Question 7

How many bits is the sys-id-ext field in a BPDU?

Answer 7

12

Question 8

There are four connections between two switches running RSTP PVST+ and you want to figure out how to achieve higher bandwidth without sacrificing the resiliency that RSTP provides. What can you configure between these two switches to achieve higher bandwidth than the default configuration is already providing?

Answer 8

Place all four links into the same EtherChannel bundle

Question 9

In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switch LAN?

Answer 9

In an improperly implemented redundant topology

Question 10

You want to configure LACP. Which do you need to make sure are configured exactly the same on all switch interfaces you are using?

Answer 10

Port speeds
Duplex
VLAN information

Question 11

Which of the following modes enable PAgP EtherChannel?

Answer 11

Desirable and Auto

Question 12

Which of the following would put switch interfaces into EtherChannel port number 1, using LACP?

Answer 12

Switch(config)#interface port-channel 1

Switch(config-if)#channel-group 1 mode active

Question 13

Which two commands would guarantee your switch to be the root bridge for VLAN 30?

Answer 13

spanning-tree vlan 30 priority 0

spanning-tree vlan 30 root primary

Question 14

Why does Cisco use its proprietary extension of PVST+ with STP and RSTP?

Answer 14

Root bridge placement enables faster convergence as well as optimal path

Question 15

What are the states in 802.1d?

Answer 15

Discarding
Listening
Learning
Forwarding

Question 16

Which of the following are roles in STP?

Answer 16

Blocking
Root
Designated
Forwarding
Non-designated.