[2021] H12-261-ENU All-in-One Exam Guide Practice To your H12-261-ENU Exam!
Preparations of H12-261-ENU Exam 2021 HCIE-R&S Unlimited 525 Questions
NEW QUESTION 231
Which of the following statement about HTTPS is wrong?
- A. When using HTTPS to access a website, if the user's browser does not recognize the digital certificate of the website, the website cannot be accessed.
- B. If the HTTPS traffic contains a virus, the router cannot directly detect the virus using IPS technology.
- C. HTTPS protocol uses TCP port 443 by default.
- D. HTTPS secures access to data by using SSL VPN.
Answer: D
NEW QUESTION 232
BGP 4+ is running between the two routers. The neighbor relationship is normal. However, the BGP routing table of the local router does not have any neighbor routing entries. Which of the following is the possible reason?
- A. The routing entries of the peer BGP routing table are non-optimal.
- B. The peer is configured with Active-route-advertise
- C. The next hop address of the BGP routing entry is unreachable.
- D. Peer ignore configured on the peer
Answer: A,B
NEW QUESTION 233
ISIS will elect DIS in the broadcast multi-access network. Which of the following statement about DIS is correct? (Multiple Choice)
- A. ISIS elects the DIS by comparing the priorities and compares the MAC addresses if the priorities are the same.
- B. DIS supports the preemption function. After the new DIS preemption is successful, you do not need to flood any LSP packets.
- C. DIS guarantees database synchronization by periodically sending CSNP messages
- D. In a broadcast multi-access network, the DIS sends Hello PDUs three times as often.
Answer: A,C,D
NEW QUESTION 234
As shown in the following figure, in IPv4 and IPv6 environments the SEL value in an IS-IS NET address is always 00.
- A. False
- B. Ture
Answer: B
NEW QUESTION 235
Which of the following command is displayed to determine that the loop fault of the switch is generated?
- A.
- B.
- C.
- D.
Answer: A
NEW QUESTION 236
A network consisting of an existing router R1, router R2, router R3 and router R4. These four routers are interconnected via a LAN network. Basic OSPF is deployed on all four routers. When you execute the command "display ospf peer" on the router R2, the status between router R2 and router R3 is "2way".
What conclusion can you draw from this output?
- A. Router R4 is DR
- B. Router R2 is DR or BDR
- C. Router R3 is not DR, nor BDR
- D. Router R2 is not DR
- E. There is no full adjacency between router R2 and router R3.
Answer: C,D,E
NEW QUESTION 237
If a switch runs RSTP, which interface on the switch will send BPDU carrying the Proposa logo?
- A. The specified port in the forwarding state
- B. Alternate port
- C. Root port in the Blocking state
- D. Designated port in non-forwarded state
Answer: D
NEW QUESTION 238
The network administrator is ready to use the 6to4 automatic tunnel to carry IPv6 data on the IPv4 network. The IPv4 address of the router interface is 138.14.85.210, so the corresponding tunnel address is 2001:8a0e:55d2:1:230:65ff: fe2c:9a6.
- A. False
- B. True
Answer: A
NEW QUESTION 239
When the ABR is a Type 5/7 LSA switch router in the NSSA area, the ABR can aggregate the Type 5 LSAs converted from the Type 7 LSA.
- A. True
- B. False
Answer: A
NEW QUESTION 240
Which of the following description about the CHAP authentication function in the PPP protocol is correct? (Multiple Choice)
- A. Calculate a Hash value by the MD5 algorithm using the authentication sequence ID, random number and key
- B. The user name must be configured under the authenticated interface of CHAP authentication.
- C. Three-message interactive authentication is required, and the username is transmitted only on the network without transmitting the password.
- D. If the authenticator does not configure a username, the password cannot be configured on the authenticated interface.
Answer: A,B,C
NEW QUESTION 241
The following topology diagram, all the interfaces of the router in the figure open the ISIS protocol, which of the following statement is correct? (Multiple Choice)
- A. If the GE0/0/0 interface of R3 is down, then R2 will become the master device.
- B. If the Ethernet 0/0/1 interface of R1 is down, then R2 will become the master device.
- C. If the Ethernet 0/0/0 interface of R1 is down, then R2 will become the master device.
- D. If the Ethernet 0/0/0 interface of R3 is down, then R2 will become the master device.
Answer: A,B,C
NEW QUESTION 242
Command ip ip-prefix ip-prefix-name [index index-number] { permit | deny} ipv4-address mask-length [greater-equal greater-equal-value ] less-equal less-equal-value]Hf-IP- Prefix-filter.
If the less-equal of a prefix list has been specified, but the greater-equal is not specified, what is the range of the prefix?
- A. [less-equal-value, 32
- B. [0,less-equal-value
- C. No restrictions
- D. mask-length, less-equal-value
Answer: D
NEW QUESTION 243
IPSG can configure static binding table or use DHCP-snooping to form a binding table.
- A. True
- B. False
Answer: A
NEW QUESTION 244
The results of the existing router data are as follows, which of the analysis conclusion is wrong?
- A. R3 router is a Level-1-2 router
- B. R3 must be a DIS of a Level-1 link
- C. R3 must be a DIS of a Level-2 link
- D. The system ID of the R3 router is 0003.0000.0000.0000
Answer: B
NEW QUESTION 245
Which of the following attributes cannot be directly referenced by the if-match of a routing policy?
- A. Regular expressions
- B. As-Path-filter
- C. IP-prefix
- D. Community-filter
Answer: A
NEW QUESTION 246
Which of the following belong to single package attack? (Multiple Choice)
- A. Scanning detection attack
- B. Special control package attack
- C. DDoS attack
- D. Malformed package attack
Answer: A,B,D
NEW QUESTION 247
As shown in the figure, R1, R2, and R3 run OSPF at the same time and announce their respective loopbacks. Which of the following description is wrong?
- A. You can use the filter import command in Area0 to filter the loopback route of R3 on the R2.
- B. You can use the filter-policy export command to filter the loopback route of R3 on the R2.
- C. You can use the filter export command to filter the loopback route of R3 in Area1 on the R2.
- D. You can filter the loopback route of R3 by using filter-policy import on the R1.
Answer: B
NEW QUESTION 248
In the case of not dividing the area, which of the following description is true about the link state routing protocol? (Multiple Choice)
- A. The router will send all the wrong path status information sent by one neighbor to all other neighbors to ensure the synchronization of the database.
- B. Routers in the entire flooding domain have the same wrong path state database
- C. Routers in the flooding domain may repeatedly receive the same link state information.
- D. Each router establishes a topological structure of the entire flood domain
- E. Each router learns the route directly from the routing update and adds it to the routing table.
Answer: B,C,D
NEW QUESTION 249
WRED is configured on the newly deployed router HW. Which of the following description of the WRED feature is correct? (Multiple choice)
- A. WRED can set different discard thresholds and packet loss rates for packets of different priorities.
- B. Low bandwidth traffic is easier to drop than high bandwidth traffic
- C. When the flow exceeds the minimum threshold, WRED begins to discard all ingress traffic (tail drop)
- D. Avoid global synchronization by selectively dropping multiple TCP streams
Answer: A,D
NEW QUESTION 250
There are now two gateway routers that provide services for hosts on a LAN network to connect to the extranet. What techniques should be used on these two redundant routers to make them the default gateway for hosts in the LAN network?
- A. BOOTP
- B. VRRP
- C. DHCP
- D. RIP
- E. OSPF
Answer: B
NEW QUESTION 251
Which AS_PATH can the command ip as-path-filter1 permit^12*74$ match?
- A. AS PATH(321122374)
- B. AS PATH(1253287423)
- C. AS PATH(1236217432374)
- D. AS PATH(32127423)
Answer: C
NEW QUESTION 252
The OSPFv3 protocol is a separately developed protocol. It differs from OSPFv2 in that OSPFv3 is based on links rather than network segments. Which of the following statement is wrong?
- A. All OSPFv3 interfaces use the Link-local address as the destination address of the packet except the virtual link.
- B. The two routers connected to the link can establish neighbor relationships even if their IPv6 address prefixes are different.
- C. The two routers connected to the link can establish neighbor relationships even if no unicast IPv6 address is configured.
- D. The routing information obtained by the OSPFv3 router from the neighbor uses the link-local address of the neighbor as the next hop of the forwarded packet.
Answer: A
NEW QUESTION 253
As shown in the figure, there are two IPv6 networks that can access the IPv4 network. At the same time, an IPSEC tunnel needs to be established between the two IPv6 networks for communication. Which of the following encapsulation modes can meet the requirements above?
- A. ESP + tunnel mode
- B. AH + tunnel mode
- C. None of the above options
- D. AH + transmission mode
Answer: A
NEW QUESTION 254
A home user has opened a 10Mb/s broadband. To improve the user experience, the operator can stabilize at 12Mb/s when performing speed measurement. If we use token bucket technology to achieve this demand, which of the following is the best?
- A. cir 10000 pir 12000
- B. cir 10000 cbs 10000 pbs 12000
- C. cir 10000 cbs 12000 pbs 12000
- D. cir 8000 pir 12000
Answer: A
NEW QUESTION 255
Which scenario can use AS-path -filter?
- A. If-match clause in Route-policy
- B. Filter the route received to the BGP neighbor according to the AS_PATH attribute carried in the route. For example, the command peer x.x.x.x as-path-filter import
- C. apply clause in Route-policy
- D. Filter the route sent to the BGP neighbor according to the AS_PATH attribute carried in the route. For example, the command peer x.x.x.x as-path-filter export
Answer: A,B,D
NEW QUESTION 256
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