On a campus network, the gateway is usually configured on the aggregation layer. What advantages does this design have compared with configuring the gateway on the access layer? (Choose all that apply.)
A. Reduce the broadcast domain on the network and the probability of broadcast storms.
B. Achieve separate convergence of Layer 2 and Layer 3 to increase the convergence speed and network stability.
C. Properly design the Layer 2 network scale, reduce network segment allocation, and improve network management efficiency.
D. Allow configuring access devices as Layer 2 devices, reducing network construction costs.
E. Leverage the STP and VRRP mechanisms to improve network reliability.
Which of the following statements regarding the designated router (DR) are true? (Choose all that apply.)
A. In DR election on a network segment, if two routers have the same DR priority, the one with a larger IP address wins.
B. The source DR sends Register messages to the RP by multicast.
C. The receiver DR sends Join messages to the multicast source or RP.
D. The assert winner on a shared network segment may not be the DR on the network segment.
Which of the following statements regarding multicast MAC addresses are false? (Choose all that apply.)
A. The high 24 bits of the multicast MAC address are 0x01005f, the 25th bit is fixed to 1, and the lower 23 bits of the MAC address map to the lower 23 bits of the multicast IP address.
B. One multicast MAC address maps to 32 multicast IP addresses.
C. A multicast MAC address identifies receivers of a multicast group on the data link layer.
D. One multicast MAC address maps to only one multicast IP address.
Which are the new requirements on the enterprise network stimulated by the mobility trend? (Choose all that apply.)
A. Unified wired and wireless management
B. Consistent service experience anytime, anywhere
C. Fast deployment of mobile applications
D. Strict hierarchical networking
Which of the following statements regarding advantages of IGMP snooping are true? (Choose all that apply.)
A. It reduces broadcast packets on a Layer 2 network and therefore conserves network bandwidth.
B. It enhances security of multicast data.
C. It enables separate accounting for each host.
D. It is not recommended because IGMP consumes many CPU resources on a Layer 2 switch.
MPLS uses LDP to provide different label distribution modes. Which of the following statements regarding LDP label distribution control modes are false? (Choose all that apply.)
A. LDP label distribution can be controlled in ordered mode.
B. In ordered mode, when an LSR is the origin of a route, it can send label mapping messages to the upstream router initiatively and does not need to wait for label mapping messages from the next hop LSR.
C. LDP label distribution cannot be controlled in independent mode.
D. In independent mode, an LSR cannot send label mapping messages to the upstream router before it receives label mapping messages from the next hop LSR.
Which of the following aspects should be considered for migration risk assessment? (Choose all that apply.)
A. Key risk positions
B. Risk impact scope
C. Risk impact time
D. Loss caused by risks
MPLS technology replaces IP forwarding with label switching. Which of the following encapsulation modes is used when MPLS runs on Ethernet networks?
A. Packet mode
B. Frame mode
C. Transport mode
D. Channel mode
E. Pipe mode
Which of the following statements regarding the transit node in the MPLS forwarding process is correct?
A. Queries the corresponding the FIB table based on the MPLS label to obtain the token.
B. Obtains the corresponding NHLFE entry based on the token in the FIB table.
C. Checks the NHLFE entry to obtain the outbound interface, next hop, outgoing label, and label operation
type.
D. If the label value is 1, the transit node directly pops out the label, processes the EXP and TTL fields, and then performs IP forwarding or forwarding by the inner label.
E. If the label value is higher than or equal to 15, the transit node replaces the old label of the MPLS packet with a new label, processes the EXP and TTL fields, and sends the MPLS packet to the next hop.
Which of the following statements regarding the MPLS forwarding process is false?
A. If an LSP fails to forward data, the MPLS control plane responsible for LSP setup can detect this error.
B. The main function of MPLS forwarding plane can add labels or delete labels from an IP packet, and forward the received packets based on the label forwarding table. The forwarding plane is connection-oriented.
C. After an IP packet enters the MPLS network, the ingress LER will analyze the IP packet and add proper labels to the packet.
D. MPLS can use Ping or Traceroute to detect LSP errors and locate faulty nodes.
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