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單項選擇題Which statement accurately describes a benefit provided by VTP（）。

A.VTP allows routing between VLANs.
B.VTP allows a single port to carry information to more than one VLAN.
C.VTP allows physically redundant links while preventing switching loops.
D.VTP allows switches to share VLAN configuration information.

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1.多項選擇題An inbound access list has been configured on a serial interface to deny packet entry for TCP and UDP ports 21, 23 and 25. What types of packets will be permitted by this ACL (Choose three.)（）。

A.FTP
B.Telnet
C.SMTP
D.DNS
E.HTTP
F.POP3

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2.多項選擇題What are two benefits of using NAT?（）

A.NAT protects network security because privat enetworks are not advertised.
B.NAT accelerates the routing process because no modifications are made on the packets.
C.Dynamic NAT facilitates connections from the outside of the network.
D.NAT facilitates end-to-end communication when IPsec is enable.
E.NAT eliminates the need to re-address all host that require extemal access.
F.NAT conserves addresses through host MAC-level multiplexing.

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3.單項選擇題What is the purpose using the traceroute command?（）

A.to map all the devices on a network.
B.to display the current TCP/IP configuration values.
C.to see how a device MAC address is mapped to its IP address.
D.to see the path a packet will take when traveling to a specified destination.
E.to display the MTU values for each router in a specified network path from source to a destination.

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4.單項選擇題On which types of network will OSPF elect a backup designated router（）。

A.point-to-point and multiaccess
B.point-to-multipoint and multiaccess
C.point-to-point and point-to-multipoint
D.nonbroadcast and broadcast multipoint
E.nonbroadcast and broadcast multiaccess

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5.單項選擇題Which type of attack is characterized by flood of packet that requesing a TCP connection to a server?（）

A.denial of service
B.brute force
C.reconnaissance
D.Trojan horse

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