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Which line from a show spantree one-command output indicates that Virtual LAN1 (VLAN1) is
functioning properly?
A. Root mode is fast Ethernet 0/26.
B. Port Ethernet 0/1 of VLAN is forwarding.
C. Designated port in Ethernet 0/1 path cos10.
D. Designated root has priority 0, address 0000.588fb600
E. VLAN1 is executing the IEEE compatible spanning tree protocol.
Answer: E
Explanation: To determine if the VLAN is functioning properly on will need to examine the first line of the
output. That is, VLAN is executing the IEEE compatible spanning tree protocol.
Incorrect Answers:
A is incorrect; this line indicates what the switch thinks is the root port.
B is incorrect; this line indicates which port is forwarding.
C is incorrect; this line indicates the designated port and its associated cost.
D is incorrect; this line indicated the MAC address of the designated root.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 199-200.
Q. 164
Which statement about the data-link connection identifier (DLCI) is true?
A. It is a number that identifies a local virtual circuit in Frame Relay network.
B. It is a signaling standard between the CPE device and the Frame Relay switch.
C. It is check speed port speed of the connection (local loop) to the Frame Relay cloud.
D. It is maximum number of uncommitted bits that the Frame Relay switch will attempt to transfer
beyond the committed information rate (CIR).
Answer: A
Explanation: The DLCI (Data-Link Connection Identifier) is a number that identifies the logical circuit
between the router and the Frame Relay switch. The Frame Relay switch maps the DLCIs between each pair of
routers to create a PVC. DLCIs have local significance in that the identifier references the point between the
local router and the Frame Relay switch, which it is connected.
Incorrect Answers:
B is incorrect; DLCI is not a signaling standard.
C is incorrect; this is the local access rate.
D is incorrect; this is not a function of DLCI.