Free H12-821_V1.0-ENU Exam Braindumps certification guide Q&A
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NEW QUESTION # 112
As shown in the figure, all three switches run the RSTP protocol, so which one of the following descriptions about the topology convergence process is correct?
- A. The edge port of SW3 will immediately enter the Forwarding state after a round of P/A mechanism
- B. The device interconnection port of the downstream link quickly enters the Forwarding state through the P/A mechanism
- C. The upstream link port of SW2 will immediately enter the Forwarding state after receiving the RSTBPDU with the Proposal bit set from 5W1.
- D. When the network is initialized, the ports of all the switches in the figure are designated ports and are in the Discarding state
Answer: D
NEW QUESTION # 113
The first 4 bits of the IP multicast address are fixed 1110, corresponding to the upper 25 bits of the multicast MAC address. Of the last 28 bits of the IP multicast address, only 23 bits are mapped to the MAC address, so 5 bits of address information are lost. The direct result is that 32 IP multicast addresses are mapped to the same MAC address.
- A. False
- B. True
Answer: B
NEW QUESTION # 114
The multicast destination address of VRRP packets is ().
- A. 224.0.0.18
- B. 224.0.0.20
- C. 224.0.1.20
- D. 224.0.1.18
Answer: A
NEW QUESTION # 115
What is the security level of the DMZ in the USG series firewall?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION # 116
Which of the following is an OSPF message that contains complete link state information?
- A. LSAck
- B. Hello
- C. DD
- D. LSR
- E. LSU
Answer: E
NEW QUESTION # 117
Which of the following types of LSAs can carry tag information for external routes?
- A. LSA2
- B. LSA3
- C. LSA4
- D. LSA5
Answer: D
NEW QUESTION # 118
How does IGMPv2 router maintain the network segment group membership? (Multiple choice)
- A. The router will query a specific group
- B. The router periodically sends Query messages, and the receiver host reports a Repeat message after receiving the Query message
- C. After receiving the eave message, the router immediately deletes the group membership
- D. The router maintains a timeout timer for each group membership, refreshes the timer if it receives the receiver host, and deletes the group membership if the timer expires
Answer: A,B,D
NEW QUESTION # 119
Among the following BGP attributes, which ones are recognized and must be followed? (Multiple choice)
- A. Local_Pref
- B. origin
- C. Community
- D. AS_Path
- E. Next hop
Answer: B,D,E
NEW QUESTION # 120
If a modular switch only supports the use of cluster cards on the main control board to establish a cluster connection, it means that the modular switch uses CSS2 stacking technology.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION # 121
Which of the following descriptions about MQC flow classification are correct? (Multiple choice)
- A. When the relationship between the rules is set to "or", when there is no ACL rule in the traffic classification, the packet must match all non-ACL rules
- B. The relationship between the rules in the traffic classification is "or" by default
- C. Setting rules can set "and" and "or" at the same time
- D. When the relationship between the rules is set to "AND", when the traffic classification contains ACL rules, the packet must match one of the ACL rules and all non-ACL rules
Answer: B,D
NEW QUESTION # 122
Option 82 in the DHCP message is called the relay agent information option, from which the administrator can obtain a lot of information about the client. Option 82 can contain at most () Sub-Options.
Answer:
Explanation:
255
NEW QUESTION # 123
Which of the following descriptions about the application of route reflectors in BGP are correct?
(Multiple choice)
- A. When RR receives the route sent by the peer, it only selects the best route for reflection
- B. The route learned by the RR from the client is only advertised to all non-clients of this RR
- C. RR advertises the routes learned from EBGP peers to all non-clients and clients
- D. The route learned by the RR from the non-client IBGP peer is advertised to all clients of this RR
Answer: A,C,D
NEW QUESTION # 124
As shown in the figure, which of the following statements is
correct?
- A. GE0/0/1 on the SWA is the backup port
- B. SWB will be the root bridge
- C. GE0/0/2 on the SWB is an Alternative port
Answer: C
NEW QUESTION # 125
Type 5 LSA does not exist in Stub area and Totally Stub area
- A. TRUE
- B. FALSE
Answer: A
NEW QUESTION # 126
As shown in the picture, which of the following statements is correct?
- A. R1 and R2 can establish an adjacency relationship, but cannot complete route calculation.
- B. R1 and 2 cannot establish an adjacency system, because the network configuration of the interface is inconsistent.
- C. R1 and R2 can establish an adjacency relationship and complete route calculation.
- D. R1 and R2 cannot establish an adjacency relationship because the OSPF process numbers are inconsistent.
Answer: A
NEW QUESTION # 127
Which of the following messages does BGP support? (Multiple choice)
- A. Hello
- B. Open
- C. Keepalive
- D. Update
Answer: B,C,D
NEW QUESTION # 128
In the network as shown in the figure, all switches run the RSTP protocol. If the E1 interface of SWB fails, when the RSTP process, then what will happen? (Multiple choice)
- A. Recalculate the spanning tree, SWB elects E2 as the root port
- B. On all non-edge forwarding ports, send topology change notifications (Topology Change Notification) to notify other switches that topology changes have occurred in the network
- C. SWB deletes the port entry of the port whose purpose is E1 in the MAC address table
- D. Send topology change notifications (Topology Change Notification) on all forwarding ports to notify other switches that topology changes have occurred in the network
Answer: A,B,C
NEW QUESTION # 129
By default, VRP will automatically aggregate the routes imported by BGP.
- A. True
- B. False
Answer: B
NEW QUESTION # 130
NAC (Network Access Control1) network access control includes three authentication methods. () Authentication, MAC authentication and Porta authentication. (If English words are involved, please use capital letters)
Answer:
Explanation:
802.1X
NEW QUESTION # 131
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