To speed up the detection of link failures in IS-IS networks, you can associate IS-IS with BFD.
- A . TRUE
- B . FALSE
In OSPF, ABR converts all Type 7 LSAs in the NSSA area to Type 5 LSAs.
- A . TRUE
- B . FALSE
Which of the following statements about IPSG is false?
- A . IPSG can prevent IP address spoofing attacks
- B . IPSG is a source IP address filtering technology based on Layer 3 connection
- C . The IPSG can enable the IP packet inspection alarm function, and link the network management to alarm
- D . IPSG can prevent the host from changing the IP address privately
The security protection actions that can be performed by a secure MAC address do not include which of the following?
- A . Protect
- B . Restrict
- C . Shutdown
- D . Remark
As shown in the figure, a campus has deployed IPv6 for service testing, and there are 4 routers in the network.
Run OSPFV3 to realize network interconnection.
Which of the following statements is false about the LSA generated by this OSPFv3 network?
- A . R1 will generate the Router-LSA by itself to describe the device connection information, and it will also receive the Router-LSA generated by R2 and R3.
- B . There are Network LSAs generated by R3 in the LSDB of R1
- C . R1 will receive 2 Link-LSAs generated by R2
- D . As an ABR, R2 will generate an Inter-Area-Prefix-LSA describing the IPv6 address prefix of Area1, and advertise it to R1 and R3
A router runs OSPF, and the output information is shown in the figure. Which of the following statements is correct?
- A . The type of the LSA is AS-external-LSA
- B . The destination network described by this LSA is 10.0.23.0/24
- C . The LSA in the figure is generated by this router
- D . This device is an ABR
All routers run OSPF as shown.
Which of the following statements is correct?
- A . R2 generates Router LSAs in both area 1 and area 0
- B . R2 forwards the Router LSA generated by R3 to R1
- C . R2 forwards the Router LSA generated by R1 to R3
- D . R2 only generates Router LSA in area 0
According to this figure, which statement is correct about the IPv6 routing information calculated by the R4 router through IS-IS?
- A . R4 has 1 IS-IS default route
- B . R4 has 2 IS-IS default routes of equal cost
- C . R4 has 2 IS-IS default routes with unequal cost
- D . R4 has no IS-IS routing entry
The routing attributes of the three routing entries are shown in the figure. It is assumed that the next hops of the three routing entries are reachable. When the three routing entries arrive at the BP router in sequence, which routing entry will BGP choose in the end by default?
- A . Route B
- B . Route C
- C . Route A
As shown in the figure, Client1 and Client2 serve as clients of RR1 and RR2 at the same time. RR1 and RR2 are in the same Cluster, and R1 has entered 10 routes. It is assumed that BGP is configured correctly.
All neighbor relationships have been established. How many routing entries exist in the BGP routing table of Client2?
- A . 10
- B . 20
- C . 0
- D . 15
Which of the following is not a hardware preparation for cutover?
- A . Test the operation of the board
- B . Power-on test
- C . Device version check
- D . Cable Continuity Test
Which of the following statements is false when troubleshooting the dual-active failure of the VRRP backup group?
- A . There is no need to check whether the switch port that transmits VRRP advertisement packets is in the same VLAN
- B . Need to check whether the VRRP group IDs on the interface are the same
- C . Need to check whether the interface IP address is in the same network segment
- D . Need to check whether the virtual IP addresses of the VRRP group are the same
When troubleshooting the EBGP neighbor relationship, you find that the two directly connected devices use the loopback port to establish a connection, so execute display current-configuration configuration bgp to check the configuration of peer ebgp-max-hophop-count. Which of the following statements is correct?
- A . hop-count/ must be greater than 2
- B . hop-count must be greater than 15
- C . hop-county must be greater than 1
- D . hop-count must be greater than 255
When a fault occurs, the fault can be classified to reduce the scope of fault location. Which of the following is not an interface configuration fault?
- A . The duplex modes of the interfaces at both ends are inconsistent
- B . IP address conflict
- C . Inconsistent interface authentication
- D . Inconsistent luminous power received at both ends
If you want to check the files under Flash, which command should you use?
- A . dir sdl
- B . dir sd0
- C . display patch-information
- D . dir flash
As shown in the figure, the APLS LSP is configured in the network and the goal is to establish an LDP session between SWA and SWB, then which of the following statement is correct?
A. Configured correctly
B. No need to enable MPLS globally
C. No need to enable MPLS on the port
D. The mpls lsr-id of the two devices cannot be configured in the same way
As shown in the figure, OSPF is enabled on all interfaces of the router, and the cost value of the link is marked in the figure. The Loopback0 interface of R2 is advertised in area 1, then the Cost value of R1 reaching 10.0.2.2/32 is:
- A . 200
- B . 150
- C . 50
- D . 100
As shown in the figure, OSPF is enabled on all interfaces of the router. The ip address marked in the figure is the IP address of the loopback0 interface. The Loopback0 of R1, R2, and R3 is advertised in area 1, and the Loopback0 of R4 is advertised in area 0, Loopback0 of R5 announces which of the following functional addresses in area 2 can ping each other?
- A . 10.0.3.3 and 10.0.5.5
- B . 10.0.4.4 and 10.0.2.2
- C . 10.0.2.2 and 10.0.3.3
- D . 10.0.2.2 and 10.0.5.5
According to this picture, we can judge:
- A . The system ID of R1 is ee8c.a0c2.baf1
- B . R1 has both level1-1 and level-1-2 dimension information
- C . R1 only has link status information of level1-2
- D . In the leve1-2 network, there are a total of 8 routers
In the network shown in the figure below, if a remote LDP session between SWA and SWC is to be realized, which of the following statement is correct?
- A . It is not necessary to specify the lsr-id of the correct peer
- B . The configuration in the figure can already be implemented
- C . You need to create a remote peer and specify the lsr-id of the peer
- D . Need to configure the direct connection interface to establish a TCP connection
As shown in the figure, MPLS/BGP IPVPN is deployed in the network, and the MP-BGP neighbor relationship is established between PE1 and PE2 through the Loopback0 interface. After the configuration is complete, it is found that CE1 and CE2 cannot learn routes from each other. Use the command on PE2 Looking at the neighbor information as shown, what is the most likely cause of the problem?
- A . The VPN instance parameters on PE1 or PE2 are incorrectly configured
- B . PE1 and PE2 do not have bell neighbors enabled in the BGP-VPN4 unicast address family view
- C . The LSP tunnel between PE1 and PE2 is not established
- D . Misconfiguration of routing protocols between PE1 or PE2 and their respective CEs
According to this figure, we can judge:
- A . R1 is configured with zone authentication
- B . The device type of R1 is Level-1
- C . The device type of R1 is Leve-2
- D . R1 sets routing domain authentication
According to this picture, we can judge:
- A . The device type of R3 must be Level-1-2
- B . Unable to determine the device type of R3
- C . The device type of R3 must be Level-1
- D . The device type of R3 must be Level-2
The IS-IS neighbor relationship between R3 and R1 is not established. According to the information in this figure, what is the possible reason?
- A . The IIH authentication of R3 and R1 failed
- B . The System IDs of R3 and R1 are duplicated
- C . The lS-Level of R3 and R1 do not match
- D . The circuit-type of the interconnection interface of R3 and R1 does not match
Network administrator A wants to use ACL to match only the four routing entries 1, 3.5, and 7 in the figure. How many ACL rules does network administrator A need to configure at least?
- A . 2
- B . 1
- C . 4
- D . 3
As shown in the figure, an engineer uses 4 routers to test branch network interoperability. Among them, R1, R2, and R3 in branch 1 deploy OSPF to realize network interoperability. R2, R3, and R4 in branch 2 deploy IS-IS to realize network intercommunication.
Now the engineer wants to implement R1 to access the loopback interface address of R4. Which of the following operations can meet this requirement?
- A . In the OSFF process and the IS-IS process of R2, the default route is advertised respectively
- B . No configuration required
- C . Advertise the default route only in the IS-IS process of R2
- D . Advertise the default route only in the OSPF process of R2
According to this figure, it can be known that in VLAN 300, on 2020-06-04, from 17:22:38 to 17:22:44, how many MAC flaps does the 00e0-fc3d-3bdb have?
- A . 5
- B . 65535
- C . 300
- D . 1
According to this figure, we can judge:
- A . R4 does not have any IS-IS neighbors
- B . R4 and ee8c.a0c2.baf3 establish IPv4 and IPv6 IS-IS neighbors
- C . R4 and ee8c.a0e2.baf3 only establish an IPv6 IS-IS neighbor
- D . R4 and ee8c.a0c2.baf3 only establish an IPv4 IS-IS neighbor
As shown in the figure, OSPF is enabled on all interfaces of the router. Which of the following statements is correct?
- A . The Type1 LSA generated by R2 in area 0 contains the routing information of 10.0.2.2/32
- B . The Type5 LSA generated by R2 in area 0 contains the routing information of 10.0.2.2/32
- C . The Type2 LSA generated by R2 in area 0 contains the routing information of 10.0.2.2/24
- D . The Type3 LSA generated by R2 in area 0 contains the routing information of 10.0.2.2/32
An engineer uses two routers to test IPV6 services, and simulates the interconnection between the headquarters and branches by running BGP4+.
The logical topology of the network is shown in the figure. Regarding the transmission of IPv6 routes between the two-way devices, which of the following statements is false?
- A . When routing is delivered, the Next Hop attribute must be an IPv6 global unicast address
- B . BGP4+ transmits routing information between peers through Update packets
- C . If the Update packet carries the AP REACH NLRI attribute, it means that the advertisement is a reachable route
- D . Route transmission will carry recognized mandatory attributes such as AS Path
As shown in the figure, Site1 and Site2 need to achieve mutual access through the operator’s BGP/MPLS IPVPN. It is known that the public network tunnel between PE1 and PE2 has been established (the label information is shown in the figure), and PE1 has advertised the route of network segment 192.168.1.0/24 in Site1 to PE2 through the MPLS BGP neighbor relationship, and the route learning is normal.
When grabbing between P and PE1, when Site2 accesses the 192.168.1.0/24 data of Site1, what should be the outermost label?
- A . 6661
- B . 3
- C . 6662
- D . 8888
Part of the configuration of R1 is as follows. Which statement about OSPF on R1 is correct?
- A . The device type of R1 is Leve-2
- B . The device type of R1 cannot be determined
- C . The device type of R1 is Level-1
- D . The device type of R1 is Level-1-2
Which is wrong with this configuration description?
- A . If there is no SubOption information of Option82 in the DHCP request packet received by GigabitEthemnet0/0/1 interface, the device will generate Option82
- B . Enabling DHCP Snooping configuration can be used to prevent DHCP Server bogus attacks
- C . Configure the GigabitEthernet0/0/1 interface as a trusted interface
- D . Enable DHCP Snooping configuration can be used to prevent ARP spoofing attacks
Assuming that the neighbor relationship between BGP routers has been established successfully, the configuration on R1 is as shown in the figure.
Which router can the routing entry 10.10.10.0/24 published by 1 be delivered to the farthest?
- A . R1
- B . R2
- C . R3
- D . R4
According to the configuration shown in the figure below, you can know that R4 has an interface advertised into IS-IS?
- A . 1
- B . 3
- C . 2
- D . 0
A campus deploys OSPF to achieve network interoperability. An engineer configures R2 as shown in the figure. Which of the following description of LSAs in the OSPF network is wrong?
[R2] acl 2000
[R2-acl-basic-2000] rule deny
[R2-acl-basic-2000] quit
#
[R2] ospf
[R2-ospf-1] area 1
[R2-ospf-1-area-0.0.0.1] filter 2000 import
[R2-ospf-1-area-0.0.0.1] quit
[R2-ospf-1] default-route-advertise always
- A . There is Type5 LSA flooding in Area2
- B . There is no Type3 LSA flooding in Area2
- C . There is Type5 LSA flooding in Area1
- D . There is no Type3 LSA flooding in Area1
As shown below:
- A . The IS-Leve1 of R3 and R1 do not match
- B . The area numbers of R3 and R1 are different
- C . The IIH authentication of R3 and R1 failed
- D . The System IDs of R3 and R1 are duplicated
OSPFV2 is an IGP running on an IPV4 network; OSPFv3 is an IGP running on an IPV6 network. The basic working mechanism of OSPFv3 is the same as that of OSPFv2, such as the election of DR and BDR.
As shown in the figure, an engineer uses three routers to test IPv6 services. He wants to realize the interconnection of IPv6 networks by running OSPFv3.
Which of the following statements about the election of the network DR is correct?
- A . After the network converges, the engineer changes the priority of R1 to 100, the priority of R2 to 10, and the default value of R3. When the network converges again, R1 is the DR
- B . After the network converges, a new device R4 is added to the broadcast link
- C . After the network converges, R1 is powered off and restarted, and when the network converges again, R3 is the DR
- D . After the network converges, R1 is the DR
As shown in the figure, OSPF is enabled on all interfaces of the router, and the cost value of the link is advertised in area 0 according to the Loogback0 of R2 as shown in the figure, then in area 1, both R2 and R3 will transmit 10.0 in the form of Typae3 LSA .2.2/32 routing information.
- A . TRUE
- B . FALSE
An enterprise purchased private lines from two operators. In order to optimize the lines, the enterprise used BGP to learn routing entries from the two operators. However, the enterprise found that the traffic of the egress route increased greatly after this configuration. After the network engineering investigation, it was found that the traffic of the two operators was passed to each other through the enterprise egress router.
Therefore, the enterprise intends to use the routing strategy so that the traffic of the packets of different carriers is no longer passed to each other. Is the configuration in the following figure correct?
- A . TRUE
- B . FALSE