You are designing your network to be able to use trunks. As part of this process you are
comparing the ISL and 802.1 Q encapsulation options. All of these statements about the two
encapsulation options are correct except which one?

The network administrator is trying to add Switch1 to the network, but the 802.1 Q trunk is not
coming up. Switch1 was previously tested in the laboratory and its trunk configuration worked fine.
What are three possible causes of this problem? (Choose three.)

You are the network administrator of a large Layer 2 network. At certain times during the day,
users complain that the network is responding very slowly.
When troubleshooting the issue, you notice the election of a new root bridge with an unknown
MAC address. Knowing that all access ports have the PortFast feature enabled, what should be
done to resolve the issue without losing redundant links?

An 802.1Q trunk is not coming up between two switches. The ports on both switches are

configured as “switchport mode desirable.” Assuming that there is no physical issue, choose two
possible causes. (Choose two.)

Refer to the exhibit. Look at the command output. What would be the most probable reason for
this port-ID mismatch?

Refer to the exhibit. Look at the command output. Assume that there is no other path, and the
configuration is correct. What would be the consequences of this situation?

Refer to the exhibit. Look at the command output. What can you use to prevent this behavior?

Before inserting a new switch in the network, the network administrator checks that the VTP
domain name is correct, the VTP mode is set to server, and revision is lower than the switches in
the network. The administrator then configures interfaces and trunks, erases existing VLANs, and
connects the switch to the network. Following that procedure, there is no connectivity in the
network. What is a possible cause of this problem?

The network administrator wants to enable an EtherChannel between two switches in “on” mode.
The administrator connects the cables and enables the interfaces, but while configuring the
EtherChannel in the first switch, a spanning-tree loop was detected. Which two of these
procedures can avoid this problem? (Choose two.)

Customer X has a hub-and-spoke Frame Relay network, with a central office and two branch
offices (RemoteA and RemoteB). Each location has only one physical link to the Frame Relay
cloud and RemoteB has a router that is not a Cisco router. Since the installation, there is no
connectivity between RemoteB and the central office. What is a possible solution to this issue?