A metro Ethernet user is connected using a PPP over Ethernet service.How many Layer 2 headers are attached to each IP datagram?（）
第1题：
A.1
B.2
C.3
D.4
第2题：
A. class of service
B. bandwidth profiles
C. user-network interface
D. Ethernet LAN circuit attributes
E. Ethernet virtual circuit attributes
第3题：
You are given a PC, a router, and a cable. Select the correct combination that will allow you to log into router VE1 locally using a terminal emulation program such as HyperTerminal.
A. Connect the PC's COM port to the router's console port using a straight-through cable.
B. Connect the PC's COM port to the router's console port using a rollover cable.
C. Connect the PC's COM port to the router's Ethernet port using a straight-through cable.
D. Connect the PC's Ethernet port to the router's Ethernet port using a rollover cable.
E. Connect the PC's Ethernet port to the router's Ethernet port using a straight- through cable.
F. None of the above
第4题：
You are given a PC, a router, and a cable. Select the correct combination that will allow you to log into the router locally using a terminal emulation program such as HyperTerminal.（）
第5题：
A. Ethernet Private Line
B. Ethernet Wire Service
C. Ethernet Relay Service
D. Ethernet Multipoint Service
E. Ethernet Relay Multipoint Service
第6题：
A.REVOKE ACCESS ON DATABASE FROM USER bob
B.REVOKE CONNECT ON DATABASE FROM USER tom
C.REVOKE tom FROM ACCESS ON DATABASE BY USER bob
D.REVOKE tom FROM CONNECT ON DATABASE BY USER bob
第7题：
A. Ethernet Private Line
B. Ethernet Wire Service
C. Ethernet Relay Service
D. Ethernet Multipoint Service
E. Ethernet Relay Multipoint Service
第8题：
You are trying to connect directly into the LAN prot of a Ezonexam router. You want to telnet to the local Cisco router using TCP/IP but cannot create a session.
What should you do to resolve the problem?
A. Use a straight-through cable to connect your computer's COM port to the router's console port.
B. Use a crossover cable to connect your computer's COM port to the router's console port.
C. Use a straight-through cable to connect your computer's COM port to the router's Ethernet port.
D. Use a crossover cable to connect your computer's Ethernet port to the router's Ethernet port.
E. Use a rollover cable to connect your computer's Ethernet port to the router's Ethernet port.
F. Use a straight-through cable to connect your computer's Ethernet port to the router's Ethernet port.
G. None of the above
第9题：
Which two of these Metro Internet services map to E-LAN services that are defined by the MEF？（）
第10题：
What is the purpose of configuring the router as a PPPoE client?（）