Two BGP peers connected through a routed firewall are unable to establish a peer relationship. What could be the most likely cause?

• A.The firewall is not configured to allow IP protocol 89.
• B.The firewall is not configured to allow UDP 179.
• C.BGP peers must be Layer 2-adjacent.
• D.EBGP multihop is not configured.

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As shown in the figure, in IPv4 and IPV6 environments, the value of the SEL filed in the IS-IS NET address is always 00.

• A.TRUE
• B.FALSE

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Which of the following is the correct description of the assertion mechanism?

• A.The DR election used by the assertion mechanism.
• B.In the assertion mechanism, broadcast data to the broadcast network segment. The winner is responsible
  for the forwarding group.
• C.The winner IP will not elect the address size for the election.
• D.The interface to the broadcast network in the assertion mechanism loser shut down.

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About FTP, ? Protocol Which of the following descriptions is correct

• A.In the mode, the server is connected to the command FTP Active, "PORT is used to tell the client which
  port it wants to send data to.
• B.In the mode, the client completes the control and data FTP Passive, the TCP user's initialization
• C.FTP TCP always uses a remote control information and data information
• D.FTP TCP 20, ICP 21 Always use the far port to establish a data session. Use the port to establish control.
  Session E.FTP TCP 21, TCP 20 Always use the far port to establish a data session Use the port to
  establish a control session

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Which of the following AS-_Path attribute values can be matched by the AS-Path filter configured using ip as- path filter 1 permit .*(100|400$command?

• A.1234 1400
• B.100
• C.300 4200
• D.3100

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