MPLS supports multi-layer labels and connection-oriented on the forwarding plane, therefore it is widely used. So, which of the following is not the cause for MPLS deployment?
A. Wide recognition by vendors
B. Traffic engineering capabilities
C. Simplifying route query on software-based routers
D. Using VPN services
Which of the following statements regarding different LSA types is false?
A. DD packets contain only LSA summary information, including LS Type, LS ID, Advertising Router, and LS Sequence Number.
B. LS Request packets contain only LS Type, LS ID, and Advertising Router.
C. LS Update packets contain complete LSA information.
D. LS Ack packets contain complete LSA information.
LSRs use various label distribution control modes to set up LSPs. Which of the following statements is false?
A. There are two label distribution control modes: independent and ordered.
B. If the label advertisement mode is DU and the label distribution control mode is Independent, an LSR distributes labels without waiting for labels from the downstream device.
C. If the label advertisement mode is DoD and the label distribution control mode is Independent, the transit device distributes labels only after receiving a label mapping message from the egress device.
D. If the label advertisement mode is DU and the label distribution control mode is Ordered, the transit LSR distributes labels to the ingress device only after receiving a label mapping message from the egress device.
The peer default-route-advertise command is executed on a BGP router to advertise a default route to neighboring routers. Which of the following statements regarding the change of local BGP routing table is true?
A. An inactive default route will be generated in the local BGP routing table, but this route will not be delivered to the IP routing table.
B. An active default route will be generated in the local BGP routing table and delivered to the IP routing table.
C. No default route will be generated in the local BGP routing table.
D. A default route will be generated in the local BGP routing table. Whether the default route will be delivered to the IP routing table depends on the route selection result.
Which of the following statements regarding the failure to establish a BGP peer relationship is false?
A. TCP port 179 may be prohibited.
B. BGP peers may be unreachable.
C. An error may occur during Open message negotiation.
D. During the establishment of an indirectly connected EBGP peer relationship, the TTL of EBGP Update messages defaults to 2 and is not manually modified.
Which type of PIM-DM protocol packet does a router send to the downstream router after it receives a Graft message from the downstream interface?
A. Join
B. Assert
C. Graft
D. Graft-ACK
Which of the following statements regarding the firewall zone security level is false?
A. The default security level of the new zone is 1.
B. Only the security level of the user-defined zone can be configured.
C. The configured security level cannot be changed.
D. Two zones cannot be configured with the same security level.
If Router Priority is set to 0 for a router, it is allowed to elect this router as a DR or BDR in an OSPF routing domain, but its priority is the lowest.
A. True
B. False
In Round Robin mode, the device sends packets based on the number of defined bytes of each queue. The bandwidth ratio of each queue is the ratio of the number of defined bytes of the local queue to the total number of defined bytes of all queues.
A. True
B. False
To prevent inter-area routing loops, OSPF does not allow advertising routing information between two non-backbone areas and allows advertising routing information only within an area or between the backbone area and a non-backbone area. Therefore, each ABR must be connected to the backbone area.
A. True
B. False
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