单项选择题

Which Frame Relay feature is responsible for transmitting keepalives to ensure that the PVC does not shut down because of inactivity?（）

A. DLCI
B. BECN
C. FECN
D. LMI
E. CIR
F. DE

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多项选择题

Which characteristics are representative of a link-state routing protocol?（）

A. Provide common view of entire topology
B. Exchange routing tables with neighbors.
C. Calculates shortest path.
D. Utilizes event triggered updates.
E. Utilizes frequent periodic updates.

多项选择题

Which of the following contribute to congestion on an Ethernet network?（）

A. Use of full duplex mode.
B. Creation of new collision domain.
C. Creation of new broadcast domain.
D. Addition of hub to the network.
E. Use of switches in the network.
F. Amount of ARP or IPX SAP traffic.