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質問 # 42
The Option field in OSPEv3 appears in all LSAs
- A. True
- B. False
正解：B
質問 # 43
The multicast protocol that can generate multicast distribution trees is?
- A. OSPF
- B. BGP
- C. PIMV2
- D. IGMPv2
正解：C
質問 # 44
Which of the following options is described correctly for the assertion mechanism? (Radio).
- A. The assertion mechanism is used for the election of DR
- B. In the assertion mechanism, the loser will shut down the interface with the broadcast network necklace
- C. In the assertion mechanism, the winner is responsible for forwarding multicast data to the broadcast segment
- D. Winner's election process does not make IP address size a condition of the election
正解：C
質問 # 45
Is the following information about BGP4+ described correctly?
- A. Modifying the RouterID of BGP causes the BGP connection between routers to be re-established.
- B. BGP4+ does not support route auto-aggregate
- C. BGP4 can use dampening commands to suppress oscillations on IBGP routes.
- D. The Next Hop attribute in BGP4+ is represented by an IPv6 address, which can be the link-local address of the next hop.
正解：A、C
質問 # 46
Regarding the characteristics of CE double attribution, the description is wrong with?
- A. CE and PE form a CE dual-home network, which can ensure high network availability.
- B. VRFs of two PEs connected to the same CE can belong to different VPNs.
- C. In the CE dual home network, it is possible to generate loops, and you can use route-tag to solve the loop problem.
- D. CE accesses the backbone through two links that can be used as both load sharing and primary and standby links.
正解：B
質問 # 47
The link quality of a company's network is poor, often failures lead to route oscillation, and even occasionally there are routing loops, in order to prevent the recurrence of these phenomena, the network administrator decided to deploy URPF in the whole network to improve the stability of the network
- A. True
- B. False
正解：A
質問 # 48
One of the things you're doing is compressing the length of ip6 addresses as much as possible . The existing IP6 address is
2013xX0C130F006009cO87641308, to be able to make this P6 address more concise, you can compress the IP6 address into which of the following? (Single choice questions).
- A. 2013:130F::9CO:876 Answer 130B
- B. 2013:0:130F:0:0:09CO:876 Answer 130B
- C. 2013:0:130F:0:0:9CO:876 Answer 130B
- D. 2013:0:130F::9CO:876 Answer 130B
- E. 213::13F::9C:876Answer 13B
正解：D
質問 # 49
Which is the correct description of optimal routing election for each protocol in the following options? (Radio).
- A. From BGP and OSPF, different route entries to reach the same destination segment are learned, and the optimal route is selected to join the IP route table by comparing the protocol's preference value.
- B. Route entries in BGP that are unreachable for the next hop are also placed in the IP routing table. In the
- C. BGP protocol, the best route to reach the same destination circumference is selected by comparing the cost values of the route entries.
- D. The OSPF protocol puts all the routing information in the LSDB into the IP routing table.
正解：A
質問 # 50
In an MPLS BGPVPN networking that does not enable MPLS penultimate hop pop-up technology. When the message reaches the last hop PE, the message has two layers of labels, and the two layers of label values can be the same.
- A. TRUE
- B. FALSE
正解：A
質問 # 51
In order to reduce the number of OSPF routes in certain areas, the OSPf protocol has developed special area functions, and the following description of the characteristics of OSPF special areas is correct
- A. ASBR-Sunmary-LSA is allowed to be published to the NSSA region
- B. AS-External-LSA is allowed to be published to the Stub region
- C. Any OSPF zone can be configured as a special zone
- D. Zone can be equipped with zhiyi
正解：D
質問 # 52
Regarding the OSPFv3 protocol, the following description is incorrect?
- A. In the case of sharing a single router, each OSPFV3 process runs independently
- B. OSPFv3 message header will contain the Instance ID field
- C. You can support running multiple instances on a single link
- D. In the same OSPFv3 process under the same interface, you can run multiple instances of
正解：D
質問 # 53
Which of the following options enables encapsulation and unencapsulation of VXLAN messages?
- A. BD
- B. VTEP
- C. VBDIF
- D. VLANIF
正解：B
質問 # 54
The main routing policy tools that BGP can use are Filter-policy and Route-policy, where Fate-policy can only filter routes and Route-policy can only modify routes
- A. TRUE
- B. FALSE
正解：B
質問 # 55
Dual-bucket, two-speed is used in traffic governance, where the number of tokens in a C bucket is TC and the number of tokens in a P bucket is TP.
When a message of length B enters, which of the following sentences is correctly described? (Multiple choice questions).
- A. If TP-B<0 and TC-B-0, the message is marked in red
- B. If TP-B >O and TC-B > 0, the message is marked as a green
- C. If TP-B~O and TC-B < 0, the message is marked green
- D. If TP-B>0 and TC-B < 0, the message is marked yellow
正解：A、B、D
質問 # 56
As shown in the figure, a company wants to achieve secure mutual access between the head office and branches through MPLSVPN, and at the same time requires that the IPN traffic of the branch bank must be forwarded through the head office to achieve traffic monitoring
- A. An MP-IBGP peer relationship is established between Spoke-PE and THE VPN routing information is exchanged.
- B. When Hub-CE passes routing information with Hub-PE, you need to configure a route on Hub-PE that allows receiving AS numbers to be repeated 1 time to receive routes published by Hub-CE
- C. VPN routing information can be exchanged between CE and PE using BGP messages
- D. Between Hub-CE and Hub-PE, and between Spoke-PE and Plan-CE, routing information can be exchanged using the OSPF protocol
正解：A
質問 # 57
If a DR needs to be elected between multicast routers running PIM-SM to be responsible for the sending and receiving of source or member multicast data, which one is described correctly below for the DR election rule?
- A. DR priority values are elected DR.
- B. Compare the DR priority first; With the same priority, you need to compare the interface IP addresses of the PIM routers to elect dr
- C. PIM routers with long interface masks are elected dr.
- D. PIM routers with small IP addresses are elected DR. PIM routers with low
正解：B
質問 # 58
What kind of scenario can use AS-path-filter? (Multiple select).
- A. The if-match clause in Route-policy
- B. A Filters routes received from BGP neighbors based on the AS PATH attribute carried by the route, such as the command peer X.x.x.x as path-filter import
- C. Filter routes sent to BGP neighbors based on the AS PATH attribute that the route carries. For example, the command peer x.x.x.x as path-filter export
- D. The apply clause in Route policy
正解：A、B、C
質問 # 59
The following is a description of how BFD sessions are established, which is the wrong one
- A. Static configuration of BFD session refers to manual configuration of BFD session parameters through the command line, including local identifiers and remote identifiers
- B. The system distinguishes between static BFD sessions and dynamic BPD sessions by dividing the identifier area Dynamically assign this landmark identifier
- C. BFD sessions can only be established dynamically
正解：A
質問 # 60
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