思科认证640-802模拟试卷4
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Which of the following components must be elected before the Spanning Tree Protocol can converge in a switched LAN?
A. Designated ports.
B. Duplex operating mode.
C. Fast mode ports.
D. Root bridge.
E. Root ports.
F. BDPU priority.
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The Ezonexam network administrator wants to ensure that only a single web server can connect to pot Fa0/1 on a catalyst switch. The server is plugged into the switch's Fast Eth. 0/1 port and the network administrator is about to bring the server online. What can the administrator do to ensure that only the MAC address of this server is allowed by switch port Fa0/1? (Choose two)
- A．Configure port Fa0/1 to accept connections only from the static IP address of the server
- B．Configure the MAC address of the server as a static entry associated with port Fa0/1
- C．Employ a proprietary connector type on Fa0/1 that is incomputable with other host connectors
- D．Configure port security on Fa0/1 to reject traffic with a source MAC address other than that of the server
- E．Bind the IP address of the server to its MAC address on the switch to prevent other hosts from spoofing the server IP address
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An administrator issues the show ip interface s0/0 command and the output displays that interface Serial0/0 is up, line protocol is up.
What does "line protocol is up" specifically indicate about the interface?
- A．The cable is attached properly.
- B．CDP has discovered the connected device.
- C．Keepalives are being received on the interface.
- D．A carrier detect signal has been received from the connected device.
- E．IP is correctly configured on the interface.
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What is the maximum number of IP addresses that can be assigned to hosts on a Ezonexam subnet that uses the 255.255.255.224 subnet mask?
A. 14
B. 15
C. 16
D. 30
E. 31
F. 32