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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Which two NLRI attributes are used by an MPLS Layer 3 VPN network to exchange VPNv4 routes between MPLS routers via MP-BGP? (Choose two.)
Answer: BD
B and D are correct NLRI attributes: RD (Route Distinguisher) IPv4 prefix(with prefix length) Next Hop VPN Label extended community: route target https://packetlife.net/blog/2013/jun/10/route-distinguishers-and-route-targets/
Source: Adapted from community discussion — leooooo
Refer to the exhibit.
An engineer observes that every time the ICMP packet is lost at a polling interval, track 1 goes down, which causes unnecessary disruption and instability in the network. The engineer does not want the traffic to be rerouted if the loss of ICMP packets is negligible. If the packet loss is persistent for a longer duration, the track must go down and the traffic must be rerouted. Which action resolves the issue?
Answer: C
Correct, a delay timer configured under the IP SLA will give leniency so that track 1 won't go down if packet loss is small enough.
Source: Adapted from community discussion — seal2
Refer to the exhibit.
An engineer is troubleshooting a prefix advertisement issue from R3, which is not directly connected to R1. Which configuration resolves the issue?
Answer: A
C doesn't really make any sense. Next-hop-self needs to be enabled on router 192.168.20.20 which is presumably R2, not on R1 itself. R2 (192.168.20.20) is peering with R3 (192.168.10.20) and R1 (192.168.20.10). I'd go with A
Source: Adapted from community discussion — Storcaks
Refer to the exhibit.
Which action resolves the issue?
Answer: A
A. an NTP server fixes this problem by not allowing the time to drift. B. local time will drift eventually and the problem will resume C. DNA center is unable to be modified in this way D. same as C
Source: Adapted from community discussion — seal2
What does IPv6 Source Guard utilize to determine if IPv6 source addresses should be forwarded?
Answer: D
A. source guard doesn't use ACLs B. source guard doesn't use ACE C. source guard does use DHCP information to fill a binding table, but is not directly responsible for source guard's actions D. source guard uses the binding table for its duties. :)
Source: Adapted from community discussion — seal2
Refer to the exhibit.
While troubleshooting an EIGRP neighbor adjacency problem, the network engineer notices that the interface connected to the neighboring router is not participating in the EIGRP process. Which action resolves the issue?
Answer: C
Should be C: R7(config)#router eigrp 100 R7(config-router)#add R7(config-router)#address-family ? ipv4 Address family R7(config-router)#address-family ip R7(config-router)#address-family ipv4 ? unicast Address Family Modifier vrf Specify parameters for a VPN Routing/Forwarding instance R7(config-router)#address-family ipv4 vr R7(config-router)#address-family ipv4 vrf ? WORD VPN Routing/Forwarding instance name
Source: Adapted from community discussion — Tester948
What are two characteristics of a VRF instance? (Choose two.)
Answer: BE
A. no, one VRF per site should suffice B. this is kind of the point of VRFs. true C. no, customer sites are not directly connected to P devices, so i don't consider this true D. no, this is what we avoid by using vrfs E. yes, you cannot associate multiple VRFs to one interface.
Source: Adapted from community discussion — seal2
How is the LDP router ID used in an MPLS network?
Answer: B
In an MPLS (Multiprotocol Label Switching) network, the LDP (Label Distribution Protocol) router ID is used to uniquely identify a router within the MPLS domain. The correct statement about the LDP router ID is: B. The loopback with the highest IP address is selected as the router ID: By default, the LDP router ID is determined based on the loopback interface with the highest IP address configured on the router. This provides a stable and predictable router ID that is not tied to the operational state of physical interfaces. The other options (A, C, and D) do not accurately describe the default behavior of how the LDP router ID is determined in an MPLS network.
Source: Adapted from community discussion — chris110
Refer to the exhibit.
A network engineer troubleshooting a packet drop problem for the host 172.16.100.5 notices that only one link is used and installed on the routing table, which saturates the bandwidth. Which action must the engineer take to resolve the high bandwidth utilization problem and share the traffic toward this host between the two available links?
Answer: C
From the output of the “show ip eigrp topology …” command, we notice network 172.16.100.5/32 was learned via two routes: + From 10.4.1.5 with FD = 409600 and AD = 128256 + From 10.3.1.6 with FD = 435200 and AD = 409600 To use both paths (called unequal cost load balancing) with EIGRP, the second path must satisfy the feasibility condition. The feasibility condition states that, the Advertised Distance (AD) of a route must be lower than the feasible distance of the current successor route. In this case, the second path did not satisfy the feasible condition as its AD (409600) is equal to the FD of the best path -> Therefore we cannot configure load balancing with “variance” command.
Source: Adapted from community discussion — chris110
Refer to the exhibit.
An OSPF neighbor relationship between R2 and R3 is showing stuck in EXCHANGE/EXSTART state. The neighbor is established between R1 and R2. The network engineer can ping from R2 to R3 and vice versa, but the neighbor is still down. Which action resolves the issue?
Answer: D
D is correct Explanation After two OSPF neighboring routers establish bi-directional communication and complete DR/BDR election (on multi-access networks), the routers transition to the exstart state. In this state, the neighboring routers establish a master/slave relationship and determine the initial database descriptor (DBD) sequence number to use while exchanging DBD packets. Neighbors Stuck in Exstart/Exchange State The problem occurs most frequently when attempting to run OSPF between a Cisco router and another vendor’s router. The problem occurs when the maximum transmission unit (MTU) settings for neighboring router interfaces don’t match. If the router with the higher MTU sends a packet larger that the MTU set on the neighboring router, the neighboring router ignores the packet.
Source: Adapted from community discussion — ZamanR
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