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質問 1：
Which of the following statement about the LSA of OSPFv33 is correct?
A. Inter-Area-Prefix LSA also contains Link-Local information.
B. When the Intra-Area Prefix LSA is Referenced Link State Type-2, the Referenced Link State id contains the interface id of the DR.
C. Router-LSA and Network-LSA do not contain routing information.
D. The Link State id of the Inter-Area Prefix-LSA contains the prefix information.
正解：B,C
質問 2：
The association between LDP and IGP refers to the suppression of the issuance of reachable routes through IGP. To ensure that the LDP and IGP linkages complete network convergence. Make the IGP and LDP keep the path consistent. Minimize the loss of traffic and improve the reliability of the entire network.
A. False
B. True
正解：B
質問 3：
A number of transition techniques have emerged in the process of replacing a P4 address used in a network with a Pv6 address. These technologies are divided into two categories, one is PV4/IPv6 coexistence technology and the other is v4/P6 interworking technology. Which of the following options belong to Pv4/IP6 coexistence technology? (Multiple Choice)
A. ISATAP
B. NAT64
C. IPv6 over IPv4
D. Dual-Stack
正解：A,C,D
質問 4：
By default, the switch configures the MAC address table to be empty. Host A connected to the switch sends the first unicast data frame. What operation will the switch perform after receiving the data frame?
A. The switch caches the data frame and waits for the destination host to send the data frame and then forward it.
B. The switch records the source MAC address of the data frame and floods the data frame.
C. The switch forwards the data frame out of an interface according to the destination MAC address of the data frame.
D. The switch will discard the data frame
正解：B
質問 5：
In an MPLS VPN network, some devices maintain VPN routing information and private network information to ensure that VPN packets can be forwarded. These devices not only need to run routing protocols but also need to run MP-BGP and MPLS protocols. What types of these devices are?
A. CE
B. P
C. PE
D. Host
正解：C
質問 6：
Which of the following about the MPLS label related information is wrong?
A. The MPLS label is 4 bytes long and is encapsulated between the link layer and the network layer.
B. By default, the device supports the PHP feature, and the label value of the egress node supported PHP that is assigned to the penultimate hop node is 3.
C. When the tag value is 0, it indicates that the tag should be ejected, and the packet must be forwarded based on IPv4.
D. If the bottom mark of the label is S=0, it indicates that the label is the bottom label of the stack and directly performs IP forwarding.
正解：D
Which of the following statement about the LSA of OSPFv33 is correct?
A. Inter-Area-Prefix LSA also contains Link-Local information.
B. When the Intra-Area Prefix LSA is Referenced Link State Type-2, the Referenced Link State id contains the interface id of the DR.
C. Router-LSA and Network-LSA do not contain routing information.
D. The Link State id of the Inter-Area Prefix-LSA contains the prefix information.
正解：B,C
質問 2：
The association between LDP and IGP refers to the suppression of the issuance of reachable routes through IGP. To ensure that the LDP and IGP linkages complete network convergence. Make the IGP and LDP keep the path consistent. Minimize the loss of traffic and improve the reliability of the entire network.
A. False
B. True
正解：B
質問 3：
A number of transition techniques have emerged in the process of replacing a P4 address used in a network with a Pv6 address. These technologies are divided into two categories, one is PV4/IPv6 coexistence technology and the other is v4/P6 interworking technology. Which of the following options belong to Pv4/IP6 coexistence technology? (Multiple Choice)
A. ISATAP
B. NAT64
C. IPv6 over IPv4
D. Dual-Stack
正解：A,C,D
質問 4：
By default, the switch configures the MAC address table to be empty. Host A connected to the switch sends the first unicast data frame. What operation will the switch perform after receiving the data frame?
A. The switch caches the data frame and waits for the destination host to send the data frame and then forward it.
B. The switch records the source MAC address of the data frame and floods the data frame.
C. The switch forwards the data frame out of an interface according to the destination MAC address of the data frame.
D. The switch will discard the data frame
正解：B
質問 5：
In an MPLS VPN network, some devices maintain VPN routing information and private network information to ensure that VPN packets can be forwarded. These devices not only need to run routing protocols but also need to run MP-BGP and MPLS protocols. What types of these devices are?
A. CE
B. P
C. PE
D. Host
正解：C
質問 6：
Which of the following about the MPLS label related information is wrong?
A. The MPLS label is 4 bytes long and is encapsulated between the link layer and the network layer.
B. By default, the device supports the PHP feature, and the label value of the egress node supported PHP that is assigned to the penultimate hop node is 3.
C. When the tag value is 0, it indicates that the tag should be ejected, and the packet must be forwarded based on IPv4.
D. If the bottom mark of the label is S=0, it indicates that the label is the bottom label of the stack and directly performs IP forwarding.
正解：D
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