If end-to-end QoS is configured on an MPLS network, the penultimate hop device on the MPLS network can pop MPLS labels from packets based on penultimate hop popping (PHP), so that the egress node can process packets based on the QoS priority in inner packets.
A network engineer provides a troubleshooting report after rectifying a fault. The actual network is simplified into the one shown in the figure, where R1 and R2 both have OSPF enabled, and function as the gateways of PCI and PC2, respectively. Given this, which of the following statements is false?
OSPF requires that routers in the same area have the same link state database (LSDB). As the number of routes on the network increases, some routers cannot carry so much routing information due to limited system resources. This state is called database overflow. If the Isdb-overflow-limit number 7 command is run on all routers on an OSPF network, which of the following conditions are likely to cause routers to enter the overflow state?
The MPLS architecture consists of the control plane and forwarding plane, each of which contains multiple protocols and entries. Which of the following tables is used to forward MPLS labeled packets?
Options:
On the network shown in the figure, IS-IS runs on R1, R2, R4, and R5, and the area ID is 49.0001. IS-IS runs on R3 and R6, and the area ID is 49.0002. The import-route isis level-2 into level-1 command is configured on R2.
In AS 65000, R1, R3, R4, and R6 each establish iBGP peer relationships with R2 and R5. R2 and R5 are Route Reflectors (RRs), and R1, R4, R3, and R6 are clients.
An iBGP peer relationship is established between R2 and R5, and the same cluster ID is configured. The iBGP peer relationships are established using Loopback0. The IP address of Loopback0 on each router is 10.0.X.X/32, where X is the router number.
R1 and R4 import the external route 192.168.1.0/24 to BGP through the import-route command, and R3 and R6 import the external route 192.168.2.0/24 to BGP through the import-route command.
Which of the following statements are true?
On the IS-IS IPv6 network shown in the figure:
Multi-topology is enabled on all routers.
The IPv6 address of Loopback0 on R4 is 2000::4/128.
The command ipv6 summary 2000::/64 level-2 is configured in the IS-IS processes of R2 and R1.
The command ipv6 import-route isis level-2 into level-1 is configured in the IS-IS processes of R1, R2, and R3.
Which of the following routers have the route 2000::/64 in their routing tables?
On a broadcast network, routers (including non-DIS routers) of the same level on a network segment can establish neighbor relationships. In the implementation of BFD for IS-IS, however, BFD sessions are established only between a DIS and non-DIS routers, not between non-DIS routers.
As shown in the figure, R1 to R4 are four routers in AS123. They all run OSPF to implement route reachability within the AS.
Network segments 10.1.1.0/24 and 10.4.4.0/24 are not advertised into OSPF.
R1 and R4 establish an IBGP peer relationship using Loopback0 and advertise network segments 10.1.1.0/24 and 10.4.4.0/24 into BGP.
Which of the following methods can be used to implement communication between PC1 and PC2?
Options:
In the figure, packets are forwarded based on MPLS on the network.
When PE2 receives a packet from P2, what is the label value carried in the packet?
Options:
On the OSPFv3 network shown in the figure, the LSDB of R2 contains ____ Router-LSAs. (Enter only digits.)
On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces.
The router ID of each router is 10.0.X.X, and the AS number is 6500X, where X is the number of the router.
Both R1 and R4 have static routes to 192.168.1.0/24, which are imported to BGP through the import-route command.
The aggregate 192.168.1.0/16 detail-suppressed command is configured on R2.
Which of the following is the path for traffic from R3 to 192.168.1.0/24?
I-SPF and PRC can speed up ISIS route convergence. PRC does not calculate nodes. Instead, it updates routes based on the shortest path tree (SPT) calculated using the SPF algorithm.
On the network shown in the figure, SW3 is the user gateway and DHCP relay agent.
The administrator plans to configure DHCP snooping on SW3 to prevent DHCP attacks.
Which of the following commands does not need to be configured on SW3?
OSPFv3 runs on R1 and R2, and the IPv6 addresses configured for the interfaces are marked in the figure.
The router IDs of R1 and R2 are 10.0.1.1 and 10.0.2.2, respectively.
Which of the following statements is true?
The figure shows the debugging information on an OSPF router. Which of the following is the router ID of this router?
On the OSPF network shown in the figure, area 1 is a common area, area 2 is a stub area, and area 3 is an NSSA. R5 imports an external route 10.0.5.5/32. Given this, which of the following routers does not have the route 10.0.5.5/32 in its routing table?
On the network shown in the figure, PC1 and PC2 are connected to the same switch (SW1) and belong to the same VLAN.
Which of the following are possible causes of a communication failure between PC1 and PC2?
Options:
On the OSPFv3 network shown in the figure:
OSPFv3 is enabled on the interfaces connecting R1, R2, and R3.
The router ID of each router is 10.0.X.X, where X is the number of the router.
When checking detailed information about an LSA on R3, the command output shows that the LSA is generated by R2 and describes the IPv6 prefix address associated with the Network-LSA.
Based on this information, which of the following statements is correct?
On the network shown in the figure, EBGP peer relationships are established between ASs through directly connected interfaces.
OSPF is deployed in AS 65456 (with OSPF disabled on interconnected interfaces between ASs).
R4 and R5 use Loopback0 to establish iBGP peer relationships with R6.
The IP address of Loopback0 on each router is 10.0.X.X/32, and the router ID is 10.0.X.X, where X is the number of the router.
R1, R2, and R3 import the external route 192.168.1.0/24 into BGP through the import-route command.
Which of the following statements are true?
On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces. The AS number is 6500X, where X is the number of the router. Both Rl and R4 have static routes to 192.168.1.0/24, which are imported to BGP through the import-route command. By default, in the routing table of R3, which of the following is the AS_Path attribute carried in the route to 192.168.1.0/24?
MPLS can carry multiple network protocol services, including unicast IPv4 services, multicast IPv4 services, unicast IPv6 services, and multicast IPv6 services.
On the IS-IS network shown in the figure, R1 imports a default route using the default-route-advertise always level-1 command. Which of the following routers have the default route in their routing tables?
The figure shows an MPLS packet with multiple labels.
Which of the following values for the S field is correct?
On the network shown in the figure, IS-IS IPv6 runs on R2, R6, and R3, and the IPv6 address of Loopback0 on R6 is 2000::6/128. OSPFv3 runs on other links. Area 1 is a stub area, and Area 2 is an NSSA. IS-IS routes are imported to OSPFv3 on R2 and R3. Which of the following statements are true?
On the OSPF network shown in the figure, drag the values on the left to the correct positions so that:
Traffic from PC1 to PC2 follows the path:PC1 -> R1 -> R3 -> R2 -> PC2
Traffic from PC2 to PC1 follows the path:PC2 -> R2 -> R1 -> PC1
Which of the following OSPF cost values should be assigned to Cost-A, Cost-B, and Cost-C to achieve this routing behavior?
On the enterprise network shown in the figure, R3 is connected to the NMS, and all devices on the network communicate with the NMS through a VPN.
During an inspection, it is found that R3 has redundant RTs (Route Targets).
Which of the following commands can be run on R3 to delete the redundant RTs without affecting the connectivity between all devices and the NMS?
Options:
An administrator runs the display mpls Isp command to view LSPs on a device. The command output is shown in the figure. Which of the following statements are true?
Service routes of an enterprise are transmitted on the network. Some configurations of PE1 and PE2 are shown in the figure. Which of the following LSAs may CE2 receive?
The device operating environment is crucial for stable device operating, including the equipment room, power supply, and heat dissipation. Maintenance personnel must be on site to maintain the device operating environment.
On the network shown in the figure, single-hop BFD is configured on R1 and R2.
A network engineer finds that the BFD session goes down. To locate the fault, the network engineer queries the BFD configurations on R1 and R2.
According to the configuration information marked in the figure, it can be determined that mismatched time parameter settings on R1 and R2 cause the BFD session to go down.
Is this statement TRUE or FALSE?
On the IS-IS network shown in the figure, R1 imports a default route using the default-route-advertise always level-1 command. Which of the following statements are true?
On the OSPFv3 network shown in the figure, area 1 is a common area. R2 generates an Inter-Area-Prefix-LSA to describe the routes of a network segment in the area. Such an LSA exists in both area 0 and area 1.
A network engineer checks LLDP neighbor information on R1. The output is shown below.
Which of the following statements are true?
LLDP Output:
yaml
CopyEdit
------------------------------------------------
GE0/0/0 has 1 neighbor(s):
Neighbor index: 1
Chassis type: MAC Address
Chassis ID: faed-ad04-0010
Port ID subtype: Interface Name
Port ID: GE0/0/0
System name: R2
System description: Huawei YunShan OS
Version 1.22.01 (AR8000 V100R002C200)
Copyright (C) 2021-2022 Huawei Technologies Co., Ltd.
HUAWEI AR8140-12G10XG
System capabilities supported: bridge router
System capabilities enabled: bridge router
Management address type: IPv4
Management address: 192.168.1.1
Expired time: 107s
If technology migration on the network affects the services running on the live network, strictly follow the preset operation process and risk control measures during the implementation of the technology migration project. Generally, this type of project is defined as a migration project. Which of the following operations performed on the live network belongs to a non-migration project?
On the OSPFv3 network shown in the figure, OSPFv3 parameters use default values. The LSDB is checked on one of the devices. The router IDs of R1, R3, and R4 are 10.0.1.1, 10.0.3.3, and 10.0.4.4, respectively. The Origin Router part of some LSAs is hidden. Complete this part. (Tokens can be reused.)
An administrator runs the display mpls lsp command to view LSPs on a device. The command output is shown in the figure.
Which of the following statements is true?
Options:
A network engineer provides a troubleshooting report after rectifying a fault. The actual network is simplified into the one shown in the figure, where R1 and R2 both have OSPF enabled and function as the gateways of PC1 and PC2, respectively.
Given this, which of the following statements are true?
Network Topology:
R1:
Interface GE0/0/0: 10.0.12.1/24 (Connected to R2)
Interface GE0/0/1: 192.168.1.1/24 (Gateway for PC1)
R2:
Interface GE0/0/0: 10.0.12.2/24 (Connected to R1)
Interface GE0/0/1: 192.168.1.2/24 (Gateway for PC2)
Options:
On the OSPF network shown in the figure, a network engineer finds that R1 and R2 have the same router ID, and both have imported default routes (with the default-route-advertise always command configured). Given this, which of the following statements is false?
Network administrators can run the clock timezone command to set the time zone of a device. If two network devices have different time zone settings, they cannot establish a neighbor relationship using a dynamic routing protocol.
Options:
OSPFv3 packets are encapsulated in IPv6 packets. Which of the following is the value of the Next Header field in the IPv6 packet header?
Options:
In CE multi-homing scenarios, if BGP AS number substitution is enabled on PEs, you can run the peer soo command on the EBGP peers of the PEs and CE to configure the Site of Origin (SoO) attribute to prevent loops.
For high reliability purposes, the following LDP messages are transmitted through TCP: discovery messages, session messages, advertisement messages, and notification messages.