GB0-381-ENU Free Exam Study Guide! (Updated 364 Questions)
GB0-381-ENU Dumps for H3CSE-Routing & Switching Certified Exam Questions & Answer
NEW QUESTION 101
B As shown in the figure, RTA, RTB, and RTC run OSPF, and the process number is 100; OSPF process 200 runs between RTA, RTB, and RTD. The cost of all interconnected links is set to 10. Set the external route priority of OSPF 100 on RTA and RTB to 190, and import an external route 172.16.1.0/24 into OSPF 100 on RTC. Both RTA and RTB are configured to import OSPF100 routes into OSPF200.
According to the above scenario analysis, the following description about RTD learning external routing 172.16.1.0/24 is correct.
- A. The route of 172.16.10.0/24 cannot be learned on RTD
- B. There is a route to 172.16.10.0/24 on RTD, and the next hop may point to RTA or RTB
- C. There are two equal-cost routes to 172.16.10.0/24 on RTD, and the next hop points to RTA and RTB respectively
- D. There is a route to 172.16.10.0/24 on RTD, and the next hop must point to RTA
Answer: B
NEW QUESTION 102
The networking is shown in the figure. RTA and RTB are located in AS 1001, RTC, RTD, and RTE are located in AS 1002. AS 1001 advertises BGP routes 11.11.11.0/24 to AS 1002. The main BGP configurations of RTC and RTD are as follows, if RTE , RTC's interconnection link is interrupted, RTE visits the 11.11.11.0/24 network segment, which wide area link is the priority to go through?
RTC]
bgp 1002
preference 20 170 200
peerRTA as-number 1001
peerRTD as-number 1002
peerRTA route-policsetmed import
route-policsetmed permit node 10
applcost 100
RTD]
bgp 1002
preference 20 170 200
peerRTB as-number 1001
peerRTC as-number 1002
peerRTA route-policsetmed import
route-policsetmed permit node 10
applcost 200
- A. Pass through wide area link 1 first, because RTC's MED 100 is less than RTD's MED 200
- B. Pass WAN link 2 first, because eBGP routing on RTD takes precedence.
- C. Pass through WAN link 1 first, because eBGP routing on RTC is preferred.
- D. Pass WAN link 2 first, because RTD MED 200>RTC MED 100.
Answer: B
NEW QUESTION 103
In the topology shown in the figure, the following configurations are performed on RTA, RTB, RTC and RTD respectively:
RTA-LoopBack0] ip address 1.1.1.1 255.255.255.255
RTA]ospf 1
RTA-ospf-1]area 1
RTA-ospf-1-area-0.0.0.1]network 10.0.0.0 0.0.0.255
RTA-ospf-1]import-route direct
RTB-LoopBack0] ip address 2.2.2.2 255.255.255.255
RTB]ospf 1
RTB-ospf-1]area 1
RTB-ospf-1-area-0.0.0.1]network 10.0.0.0 0.0.0.255
RTB-ospf-1-area-0.0.0.1]area 0
RTB-ospf-1-area-0.0.0.0]network 20.0.0.0 0.0.0.255
RTB-ospf-1]import-route direct
RTC-LoopBack0] ip address 3.3.3.3 255.255.255.255
RTC]ospf 1
RTC-ospf-1]area 0
RTC-ospf-1-area-0.0.0.0]network 20.0.0.0 0.0.0.255
RTC-ospf-1-area-0.0.0.0]area 2
RTC-ospf-1-area-0.0.0.2]nssa
RTC-ospf-1-area-0.0.0.2]network 30.0.0.0 0.0.0.255
RTC-ospf-1-area-0.0.0.2]network 3.3.3.3 0.0.0.0
RTD-LoopBack0] ip address 4.4.4.4 255.255.255.255
RTD]ospf 1
RTD-ospf-1]area 2
RTD-ospf-1-area-0.0.0.2]network 30.0.0.0 0.0.0.255
RTD-ospf-1-area-0.0.0.2]nssa
RTD-ospf-1]import-route direct
Which of the following routes may not exist in the RTD routing table ______.
- A. 3.3.3.3/32
- B. 1.1.1.1/32
- C. 0.0.0.0/0
- D. 2.2.2.2/32
Answer: B,C,D
NEW QUESTION 104
As shown in the figure, 4 routers are connected to an Ethernet link. The router interface is a broadcast network type. Judging from the information in the figure, there are ________ IS-IS adjacencies on the Ethernet link.
- A. 0
- B. 1
- C. 2
- D. 3
Answer:
Explanation:
B
There is no picture for this question, just remember the following knowledge points
NEW QUESTION 105
From RTA to RTD, etc., perform IS-IS networking as shown in the figure. The Stem-IDs of RTA, RTC, and RTD are shown in the figure.
Then ______ of the following options can be used as the Stem-ID of RTB.
- A. 0002.0003.0000
- B. 0004.0000.0000
- C. 0002.0000.0000
- D. 0003.0000.0000
Answer: A,C
NEW QUESTION 106
Z router uses the Ethernet MAC address to generate the NET address of the IS-IS process. The disadvantages are ________.
- A. MAC address is not global and inconvenient to manage
- B. MAC address is not necessarily related to network planning, and MAC address is not easy to remember
- C. The length of the MAC address and the Stem-ID in the NET are the same, which is easy to confuse
Answer: A,B
NEW QUESTION 107
In the OSPF broadcast network, there are 4 routers RTA, RTB, RTC, and RTD in the same network segment. The priorities are 2, 2, 1, and 2, and the router IDs are 172.16.1.1, 172.16.2.1, 172.16.3.1 and 172.16.4.1.
If the OSPF protocol is activated on these 4 routers at the same time, the DR selected by OSPF is _____.
- A. RTA
- B. RTC
- C. RTB
- D. RTD
Answer: D
NEW QUESTION 108
In the topology shown in the figure, perform the following configuration in RTA and RTB respectively:
RTA-ospf-1-area-0.0.0.1]network 192.168.0.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]network 192.168.1.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]network 192.168.2.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]network 192.168.3.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]network 192.168.4.0 0.0.0.255
RTB] acl number 2000
RTB-acl-basic-2000] rule 0 permit source 192.168.0.0 0.0.0.255
RTB-acl-basic-2000] rule 5 permit source 192.168.1.0 0.0.0.255
RTB-ospf-1-area-0.0.0.1] filter 2000 export
Then the impossible routes in the RTC routing table are _____
- A. 192.168.4.0/24
- B. 192.168.0.0/24
- C. 192.168.2.0/24
- D. 192.168.1.0/24
Answer: A,C
NEW QUESTION 109
In the OSPF protocol, the types of LSAs that ASBRs cannot aggregate are _______
- A. Tpe7 LSA
- B. Tpe5 LSA
- C. Tpe4 LSA
- D. Tpe3 LSA
Answer: C,D
NEW QUESTION 110
A local area network has been in operation for 2 years (17,520 hours), and was out of service for 6 hours due to equipment failure. After the network was expanded and new equipment was added, it ran for another year (8,760 hours), and was out of service for another 4 hours due to a software failure. Regarding the availability of this network (Availabilit), which of the following statements are correct?
- A. The availability of the network after the expansion is better than before the expansion
- B. The availability of the network after the expansion is worse than before the expansion
- C. From the beginning of the network to the present, its availability is 99.99%
- D. Before expansion, network availability was 99.97%
Answer: B,D
NEW QUESTION 111
In the topology shown in the figure, the network layer is reachable between RTA and RTB, and RTB and RTC.
Perform the following configuration on RTA, RTB and RTC respectively:
RTA]ospf 1
RTA-ospf-1]area 1
RTA-ospf-1-area-0.0.0.1]network 192.168.1.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]network 1.1.1.1 0.0.0.0
RTB]ospf 1
RTB-ospf-1]area 1
RTB-ospf-1-area-0.0.0.1]network 192.168.1.0 0.0.0.255
RTB-ospf-1-area-0.0.0.1]area 0
RTB-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
RTB-ospf-1-area-0.0.0.0]network 192.168.2.0 0.0.0.255
RTC]ospf 1
RTC-ospf-1]area 0
RTC-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
RTC-ospf-1-area-0.0.0.0]network 192.168.2.0 0.0.0.255
RTC-ospf-1]silent-interface all
The following statement is correct ________
- A. RTC can accept Hello messages sent by RTB
- B. Cannot establish neighbors between RTB and RTC
- C. RTC does not send Hello packets to RTB
- D. Neighbors can be established normally between RTA and RTB
Answer: A,B,C,D
NEW QUESTION 112
The routers RTA and RTB are located in the same autonomous system. The BGP related configuration is as follows, then RTA and RTB are _____.
RTA]
bgp 100
timer keepalive 10 hold 30
peerRTB as-number 100
[RTB]
bgp 100
timer keepalive 30 hold 90
peerRTA as-number 100
- A. Able to establish IBGP neighbor relationship, the holdtime of RTA is 30s, and the holdtime of RTB is 30s
- B. Cannot establish IBGP neighbor relationship
- C. Able to establish IBGP neighbor relationship, the holdtime of RTA is 90s, and the holdtime of RTB is 90s
- D. The IBGP neighbor relationship can be established. The holdtime of RTA is 30s and the holdtime of RTB is 90s.
Answer: A
NEW QUESTION 113
Which of the following tools are route filters?
- A. filter-polic
- B. route-polic
- C. Address prefix list
- D. ACL
Answer: A,B,C,D
NEW QUESTION 114
The following statement about IS-IS and OSPF is correct.
- A. IS-IS is better than OSPF in scalability, but OSPF is more widely used
- B. The backbone area of IS-IS must be Area0 and must be continuous
- C. An IS-IS router can only belong to one area, while different interfaces of an OSPF router can belong to multiple areas
- D. IS-IS runs on the transport layer, OSPF runs on the network layer, both use SPF algorithm
Answer: A,C
NEW QUESTION 115
The RIP protocol is enabled on a router with a priority of 10; the OSPF protocol is also enabled with a priority of 100. If two protocols have learned the route 10.0.0.0/8 at the same time, the metric values are 1 (hop count) and 100 (cost value), and the next hop is 1.0.0.1 and 1.0.0.2 respectively.
After the router receives a packet with a destination address of 10.0.0.1, how to deal with it?
- A. Unable to judge
- B. Forward to 1.0.0.1
- C. Forward to 1.0.0.2
- D. Forward to 1.0.0.1 and 1.0.0.2 at the same time
Answer: B
NEW QUESTION 116
The advantages of DR/BDR election in the OSPF protocol include ______.
- A. After DR fails, BDR immediately becomes DR, which can reduce the convergence time after routing changes
- B. Reduced the number of adjacencies maintained
- C. The router with the highest stability becomes DR/BDR, which can enhance the robustness of the network
Answer: A,B
NEW QUESTION 117
In the topology shown in the figure, perform the following configurations on RTA and RTC respectively:
RTA-ospf-1] area 1
RTA-ospf-1-area-0.0.0.1] authentication-mode simple
RTA] interface GigabitEthernet0/0
RTA-GigabitEthernet0/0] ospf authentication-mode simple plain 12345
RTC-ospf-1] area 0
RTC-ospf-1-area-0.0.0.0] authentication-mode simple
RTC] interface GigabitEthernet0/0
RTC-GigabitEthernet0/0] ospf authentication-mode simple plain 54321
If RTB needs to establish neighbor relationships with RTA and RTC respectively, which of the following configurations needs to be performed on RTB?
- A. RTB-ospf-1-area-0.0.0.0] authentication-mode simple RTB] interface GigabitEthernet0/0 RTB-GigabitEthernet0/0] ospf authentication-mode simple plain 12345 RTB] interface GigabitEthernet0/1 RTB-GigabitEthernet0/1] ospf authentication-mode simple plain 54321
- B. RTB-ospf-1-area-0.0.0.0] authentication-mode simple RTB-ospf-1-area-0.0.0.1] authentication-mode simple RTB] interface GigabitEthernet0/0 RTB-GigabitEthernet0/0] ospf authentication-mode simple plain 12345 RTB] interface GigabitEthernet0/1 RTB-GigabitEthernet0/1] ospf authentication-mode simple plain 54321
- C. RTB-ospf-1-area-0.0.0.0] authentication-mode md5 RTB-ospf-1-area-0.0.0.1] authentication-mode md5 RTB] interface GigabitEthernet0/0 RTB-GigabitEthernet0/0] ospf authentication-mode simple plain 12345 RTB] interface GigabitEthernet0/1 RTB-GigabitEthernet0/1] ospf authentication-mode simple plain 54321
- D. RTB-ospf-1-area-0.0.0.0] authentication-mode simple RTB-ospf-1-area-0.0.0.1] authentication-mode simple RTB] interface GigabitEthernet0/0 RTB-GigabitEthernet0/0] ospf authentication-mode simple plain 54321 RTB] interface GigabitEthernet0/1 RTB-GigabitEthernet0/1] ospf authentication-mode simple plain 12345
Answer: B
NEW QUESTION 118
Level-2 routing exists in ________.
- A. Between ES and IS
- B. Between IS in the same Area
- C. Between different domains
- D. Between different areas
Answer: D
NEW QUESTION 119
The router RTA and RTB are eBGP neighbor relationships. RTA advertises route 10.10.10.0/24 and sets the community attribute, but looking at the routing table of RTB, it is found that the route 10.10.10.0/24 learned from RTA does not carry the community attribute. What could cause the loss of community attributes?
- A. The community attribute NO_ADVERTISE was set when RTA released 10.10.10.0/24
- B. RTA does not configure peerRTB advertise-communit
- C. The community attribute NO_EXPORT was set when RTA released 10.10.10.0/24
- D. RTB is not configured with peerRTA advertise-communit
Answer: B
NEW QUESTION 120
In the IS-IS network as shown in the figure, after the routing of each router is stable, the IS-IS Level-1 routing in the IS-IS LSDB of RTE has ______.
- A. 10.1.4.0/30
- B. 10.3.4.0/30
- C. 10.1.5.0/30
- D. 10.4.5.0/30
Answer: A,B,C,D
NEW QUESTION 121
In the OSPF protocol, the correct statement about ABR aggregation is ______
- A. ABR can aggregate Tpe4 LSA not generated by itself
- B. ABR can aggregate all Tpe5 LSAs
- C. ABR can aggregate Tpe3 LSA
- D. When the ABR colleague is also a conversion router in the NSSA area, the Tpe5 LSA converted from the Tpe7 LSA can be aggregated
Answer: C,D
NEW QUESTION 122
In the OSPF protocol, when the interface network type is P2P (point-to-point), the default Hello time interval and neighbor failure time are respectively ______.
- A. 30 , 120
- B. 40 , 120
- C. 10 , 30
- D. 10 , 40
Answer: D
NEW QUESTION 123
In the BGP priority process, each attribute has a different priority.
Regarding the priority of these attributes, which of the following arrangements is correct?
- A. Local priority, ORIGIN, MEDRouter, ID
- B. MED, ORIGIN, IGP Metric, Router ID
- C. Local priority, Preferred-value, MEDRouter, ID
- D. AS path, MED, IGP Metric, Originator_ID
Answer: A,D
NEW QUESTION 124
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