The following description of the PPPoE data frame is correct?( Multiple choice questions).

• A.The Session_ID of the PPP session is not allowed to change and must be the specified in the Discovery phase
• B.The Ethernet_Type domain is fixed to Ox8863
• C.When PPPoE passes session data, Code must be set to Ox0
• D.Once a PPPoE session is established, all Ethernet packets are unicast

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The TTL field encapsulated in the MPLS label header can prevent infinite loops of MPLS packets.
Which of the following statements regarding the TTL field are correct?

• A.If TTL copy is disabled, users can use the tracert function to view the LSR of the MPLS domain.
• B.The processing of IP TTL copy hides the LSR in an MPLS domain, improving network security.
• C.MPLS provides two processing modes on the TTL field:
  TTL in the MPLS header copies the IP TTL value when an IP packet enters the MPLS network.
  The ingress LER sets the TTL value in the MPLS header to 255.
• D.MPLS encapsulation in frame mode supports the TTL field. MPLS encapsulation in cell mode does not support the TTL field.

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A routing tool can define multiple entries. Which tool will automatically add a deni-any entry at the end of the configuration?

• A.Route policy
• B.AS-path-filter
• C.Community-tilter
• D.IP-prefix

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Which of the following is the purpose of configuring IS-IS fragmentation on an IS-IS device?

• A.Disable the device from establishing IS-IS neighbor relationships.
• B.Enable the device to support more IS-IS routes.
• C.There is no practical purpose.
• D.Disable the device from learning IS-IS link-state information.

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As shown in the figure, the PPP link between R1 and R2 is not in the same network segment, but the R1 and R2 direct connectors can communicate, and the Ethernet link cannot communicate under the same planning, why?

• A.The interconnect POS ports of R1 and R2 learn the 32-bit host route for each other's direct connections through IPCP
• B.The data packets of the interconnect POS ports of R1 and R2 do not need to encapsulate ethernet headers and do not need to use ARP to request MAC addresses
• C.The interconnect POS port of RI and R2, through LCP learns the MAC address of the opposite termination , does not need to use ARP to request the MAC address
• D.The interconnect POS ports of R1 and R2 learn the 24-bit subnet route of each other's direct connection ports through IPCP

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