Question 221 · 578 in bank
What TCP port is used by LDP to provide for reliable transport connections?
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Answer: A
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300-410 practice questions 221–230
Implementing Cisco Enterprise Advanced Routing and Services (ENARSI)578 questions across 58 pages are complete and free, with no account or card.
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Question 222 · 578 in bank
Select 2Which of the following are control plane protocols used within a service provider MPLS network? (Choose two.)
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Answer: BE
Explanation
Control plane protocols are responsible for the operations and signaling within a network, including in an MPLS (Multiprotocol Label Switching) environment. The correct answers from the given options are: B. RSVP (Resource Reservation Protocol) E. LDP (Label Distribution Protocol) Explanation: RSVP: It's used for reserving resources and is also employed as a signaling protocol in MPLS Traffic Engineering (TE). LDP: This protocol is used for label distribution in MPLS, enabling routers to learn the labels to use for forwarding traffic. Option C (Targeted LDP) is a specialized use of LDP, so it's related but not a distinct protocol in this context. Options A (OAM - Operations, Administration, and Maintenance) and D (SNMP - Simple Network Management Protocol) are not typically classified as control plane protocols within the context of an MPLS network, as they are more related to management and monitoring.
Source: Adapted from community discussion — HarwinderSekhon
Question 223 · 578 in bank
In a typical MPLS VPN, which routers act as the MPLS label imposition and disposition points in the network?
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Answer: C
Explanation
yes correct is C: Provider Edge Routers (PE) operate at the edge of the provider network. They perform Label Edge Router (LER) imposition and disposition operations at the edge of an MPLS network. In an MPLS network, the ingress edge router receives the packet and adds a label to the packet. The egress edge router removes the label. https://content.cisco.com/chapter.sjs?uri=%2Fsearchable%2Fchapter%2Fwww.cisco.com%2Fcontent%2Fen%2Fus%2Ftd%2Fdocs%2Fswitches%2Fmetro%2Fme3600x_3800x%2Fsoftware%2Frelease%2F15-1_2_ey%2Fconfiguration%2Fguide%2F3800x3600xscg%2Fswmpls.html.xml#:~:text=They%20perform%20Label%20Edge%20Router,edge%20router%20removes%20the%20label.
Source: Adapted from community discussion — inteldarvid
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Question 224 · 578 in bank
In an MPLS network, which of the following describes the role of the Provider (P) router?
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Answer: B
Question 225 · 578 in bank
Select 2The MPLS LDP autoconfiguration feature allows you to enable LDP on every interface that is associated with an IGP instance. Which of the following Interior Gateway Protocols support this? (Choose two.)
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Answer: AB
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Question 226 · 578 in bank
In an MPLS VPN network, how are customer routes controlled and distributed?
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Answer: D
Explanation
"D" is more accurate. https://notes.networklessons.com/mpls-route-target MPLS Route Target When implementing MPLS VPNs, we use a Route Target or RT to allow PE routers to control the distribution of VPN routes to the appropriate VRFs. Now an RT is actually a BGP extended community attribute that is used to control the distribution of VPN routing information between PE routers.
Source: Adapted from community discussion — HungarianDish_111
Question 227 · 578 in bank
At which layer of the OSI model is an MPLS label imposed?
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Answer: C
Question 228 · 578 in bank
Select 2Which of the following are valid IPv6 Router Advertisement (RA) Guard modes? (Choose two.)
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Answer: BC
Explanation
B, C There are two primary RA Guard modes: Host mode (Default mode): In this mode, the RA Guard function expects that trusted ports are connected to hosts that do not send any Router Advertisement or Router Redirect messages. This mode will drop all such messages if received on a trusted port. Router mode: In this mode, the RA Guard function allows trusted ports to send Router Advertisement and Router Redirect messages. This mode is configured if the trusted port is connected to a legitimate router.
Source: Adapted from community discussion — Malasxd
References
Question 229 · 578 in bank
Which of the following statements are true regarding the e IPv6 RA Guard feature?
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Answer: B
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Question 230 · 578 in bank
Refer to the exhibit. The OSPF neighbor relationship is not coming up. What must be configured to restore OSPF neighbor adjacency?
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Answer: D
Explanation
*Jan 10 07:12:55.724: OSPF-1 ADJ Et0/0: Rcv DBD from 10.10.10.2 seq 0x1BFC opt 0x52 flag 0x7 len 32 mtu 100 state EXCHANGE *Jan 10 07:12:55.724: OSPF-1 ADJ Et0/0: Nbr 10.10.10.2 has smaller interface MTU *Jan 10 07:12:55.724: OSPF-1 ADJ Et0/0: Send DBD to 10.10.10.2 seq 0x1BFC opt 0x52 flag 0x0 len 32 IOU1#undebug all All possible debugging has been turned off IOU1# IOU1# IOU1# *Jan 10 07:13:06.410: %OSPF-5-ADJCHG: Process 1, Nbr 10.10.10.2 on Ethernet0/0 from EXCHANGE to DOWN, Neighbor Down: Too many retransmissions IOU1# *Jan 10 07:14:06.417: %OSPF-5-ADJCHG: Process 1, Nbr 10.10.10.2 on Ethernet0/0 from DOWN to DOWN, Neighbor Down: Ignore timer expired
Source: Adapted from community discussion — Girmiti
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