How does ERS use the VLAN tag？（）

packets travelling through trunk links. When an Ethernet frame traverses a trunk link, a special VLAN tag is added to the frame and sent across the trunk link .How does ERS use the VLAN tag？（）

A. provide service internetworking

B. support transparency for Layer 2 frames

C. indicate destination as a connection identifier

D. map to the DLCI in service internetworking

A.need

B.use

C.cost

D.take

A.build

B.see

C.use

D.try

Which way does the following paragraph use to start a topic？

Many people smoke. They smoke because they think it makes them cooler and it is a good way for them to show their manhood.

A.Subject +what

B.Subject + example

C.Subject+ why

D.Subject +how

A．Location of firefighting equipment onboard B．How to use firefighting equipment onboard

C．Information on how handle different types of fires

D．Fire alarm signal, fire instruction and your assignment

A．the things are used by people, too

B．people feel the things too often

C．people know how to use the things

D．the things are easy to feel

W: How should I select the right websites？

M: When you visit a site, remember that you are the one that can say whether a site and its resources are right for you or not.

Q: What does the man mean？

A.The sites your friends use may not be the most suitable for you.

B.Each website is useful for you.

C.You can choose any sites you like.

D.You can just use the websites recommended by your friends.

A．To explain how she got her summer jo

B．To emphasize how many people she met on the Navajo reservation．

C．To point out that her friend is studying the Navajo language and culture

D．It required her to use her knowledge of the Navajo language and culture anthropology department．

A.by encrypting all passwords passing through the router

B.by encrypting passwords in the plain text configuration file

C.by requiring entry of encrypted passwords for access to the device

D.by configuring an MD5 encrypted key to be used by routing protocols to validate routing exchanges

E.by automatically suggesting encrypted passwords for use in configuring the router

A. by encrypting all passwords passing through the router

B. by encrypting passwords in the plain text configuration file

C. by requiring entry of encrypted passwords for access to the device

D. by configuring an MD5 encrypted key to be used by routing protocols to validate routing exchanges

E. by automatically suggesting encrypted passwords for use in configuring the router