According to the IEEE 802.1Q standard, which position does VLAN identification field in the Ethernet frame ?

• A.in the middle of source MAC address and destination MAC address
• B.before the source MAC address and destination MAC address
• C.after the source MAC address and destination MAC address
• D.not fixed

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Which layer of the OSI model does the router manly work in ?

• A.Network layer
• B.Link Layer
• C.Physical Layer
• D.Transport Layer

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About the using of ADSL interleave mode, which the following statement is correct?

• A.Poor stability, short delay
• B.Increased stability, short delay
• C.Poor stability, long delay
• D.Increased stability, long delay

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The following command isql landing database which is correct?

• A.isql -Usa -PN2000DBServer -Ssa_password
• B.isql -Usa_password -Ssa -PN2000DBServer
• C.isql -Usa -Ssa_password -SN2000DBServer
• D.isql -Usa -Psa_password -SN2000DBServer

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Link layer defines the electrical, mechanical process and function, to realize line activation, keeping and demolition on both ends of system connection.

• A.False
• B.True

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