Question 1.
Which protocol allows for PVST (per VLAN spanning tree)?

a) 802.10
b) 802.1Q
c) ISL
d) 802.1d

Answer

Question 2.
Referring to the figure, assume EtherChannel is properly configured on Switches A and B. Also assume that the frame flow for frames from PC-1 to PC-2 uses the top link in the diagram and that frames from PC-2 to PC-1 use the bottom link.

If the top link fails

a) frames from PC-1 to PC-2 will be dropped, but frames from PC-2 to PC-1 will be unaffected.
b) after Spanning Tree reconverges, frames from PC-1 to PC-2 will be forwarded on the bottom link.
c) frames from PC-1 to PC-2 will almost immediately be forwarded on the bottom link.
d) both frames from PC-1 to PC-2 and frames from PC-2 to PC-1 will be dropped.

Answer

Question 3.
VTP is used to auto-negotiate trunk settings between directly connected switches.

a) True
b) False

Answer

Answers

Question 1.
Which protocol allows for PVST (per VLAN spanning tree)?

a) 802.10
b) 802.1Q
c) ISL
d) 802.1d

Answer
c) ISL

Explanation
ISL is the Cisco proprietary trunking protocol that supports per VLAN spanning tree (PVST). 802.1Q does not support this. 802.10 is used for trunking VLANs across a FDDI network and 802.1D is plain old Spanning Tree.
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Question 2.
Referring to the figure, assume EtherChannel is properly configured on Switches A and B. Also assume that the frame flow for frames from PC-1 to PC-2 uses the top link in the diagram and that frames from PC-2 to PC-1 use the bottom link.

If the top link fails

a) frames from PC-1 to PC-2 will be dropped, but frames from PC-2 to PC-1 will be unaffected.
b) after Spanning Tree reconverges, frames from PC-1 to PC-2 will be forwarded on the bottom link.
c) frames from PC-1 to PC-2 will almost immediately be forwarded on the bottom link.
d) both frames from PC-1 to PC-2 and frames from PC-2 to PC-1 will be dropped.

Answer
c) frames from PC-1 to PC-2 will almost immediately be forwarded on the bottom link.

Explanation
EtherChannel failover is handled by the Catalyst hardware and happens automatically in a matter of milliseconds so as to be transparent to the end user.
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Question 3.
VTP is used to auto-negotiate trunk settings between directly connected switches.

a) True
b) False

Answer
b) False

Explanation
VTP (VLAN Trunk Protocol) is used to propagate VLAN configuration information between switches. Trunk parameters must be set with appropriate CLI commands.
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