Cisco 300-410 Online Practice Questions and Exam Preparation

Cisco 300-410 Online Questions & Answers

• Question 451:

  Which Layer 3 VPN attribute allows different customers to connect to the same MPLS network with overlapping IP ranges?

  A. RT
  B. RD
  C. VRF
  D. MP-BGP
  B. RD

  ---

  In a Layer 3 VPN (Virtual Private Network) over an MPLS (Multiprotocol Label Switching) network, the attribute that allows different customers to connect with overlapping IP ranges is the Route Distinguisher (RD).

  RD is a unique identifier that is prepended to each IP address in a customer's VPN to create a unique VPNv4 address. This allows customers to use overlapping IP addresses without conflict. The RD makes it possible for the same IP prefix to exist in different VPNs, which is crucial when customers have overlapping IP ranges.

  References: MPLS Layer 3 VPN Explained - NetworkLessons.com MPLS: Layer 3 VPNs Configuration Guide - Cisco Understanding Using MPLS-Based Layer 3 VPNs on Switches - Juniper

• Question 452:

  Refer to the exhibit.

  

  R1 should receive 10.16.2.0/24 from R2. Which action resolves the issue?

  A. Add prefix-list seq 1 on R1 to permit 10.16.0.0/22.
  B. Add prefix-list seq 1 on R1 to permit 10.16.2.0/24.
  C. Modify prefix-list seq 5 on R2 to permit 10.16.0.0/22.
  D. Modify prefix-list seq 5 on R2 to permit 10.16.0.0/23.
  C. Modify prefix-list seq 5 on R2 to permit 10.16.0.0/22.

• Question 453:

  Refer to the exhibit.

  

  An engineer must filter incoming EIGRP updates to allow only a set of specific prefixes. The distribute list is tested, and it filters out all routes except network 10.10.10.0/24. How should the engineer temporarily allow all prefixes to be learned by the router again without adjusting the existing access list?

  A. A permit any statement should be added before completing the ACL with the required prefixes, and then the permit any statement can be removed.
  B. A permit 20 statement should be added before completing the ACL with the required prefixes, and then the permit 20 statement can be removed.
  C. A continue statement should be added within the permit 10 statement before completing the ACL with the required prefixes, and then the continue statement can be removed.
  D. An extended access list must be used instead of a standard access list to accomplish the task.
  B. A permit 20 statement should be added before completing the ACL with the required prefixes, and then the permit 20 statement can be removed.

• Question 454:

  Which mechanism must be chosen to optimize the reconvergence time for OSPF at company location 408811049 that is less CPU-intensive than reducing the hello and dead timers?

  A. SSO
  B. BFD
  C. Dead Peer Detection keepalives
  D. OSPF demand circuit
  B. BFD

• Question 455:

  Refer to the following set of commands:

  

  Which of the following statements is TRUE about the given set of commands?

  A. IPv4 and IPv6 are running simultaneously on rtrA
  B. The IPv4 address is translated to an IPv6 address
  C. The IPv6 address is an IPv4-compatible address
  D. A tunnel is created for the interoperability of the IPv4 and IPv6 addresses
  A. IPv4 and IPv6 are running simultaneously on rtrA

  ---

  The correct answer is that IPv4 and IPv6 are running simultaneously on rtrA. The set of commands enables IPv6 on the rtrA router and assigns an IPv4 address and an IPv6 address to the Fa0/0 interface. This indicates that the router is a dual-stack router on which both IPv4 and IPv6 are running simultaneously.

  The IPv4 address is not translated to the IPv6 address by the given set of commands because NAT-PT is not enabled on the router. To enable NAT-PT on a router, you need to use the ipv6 nat command. In addition, the ipv6 nat prefix command should be used to specify an IPv6 prefix.

  The IPv6 address is not an IPv4-compatible address. IPv4-compatible IPv6 addresses are used in automatic IPv4-compatible IPv6 tunnels. These addresses refer to those IPv6 unicast addresses that have zeros in the first 96 bits and an IPv4 address in the last 32 bits. For example, 0:0:0:0:0:0:192.156.10.67 is an IPv4- compatible IPv6 address where 192.156.10.67 is an IPv4 address. The IPv6 address (2001:0:1:1:D52::F3C/64), in this case, is not an IPv4-compatible IPv6 address.

  A tunnel is not created for the interoperability of the IPv4 and IPv6 addresses because the given set of commands configures the router as a dual-stack router. There are no commands for configuring a tunnel on the router.

  Objective:

  Network Principles

  Sub-Objective:

  Recognize proposed changes to the network

  References:

  Cisco IOS IPv6 Configuration Guide, Release 12.4 > Implementing IPv6 Addressing and Basic Connectivity > Configuration Examples for Implementing IPv6 Addressing and Basic Connectivity > Example: Dual Protocol Stacks Configuration

• Question 456:

  What is an advantage of implementing BFD?

  A. BFD provides faster updates for any flapping route.
  B. BFD provides millisecond failure detection
  C. BFD is deployed without the need to run any routing protocol
  D. BFD provides better capabilities to maintain the routing table
  B. BFD provides millisecond failure detection

• Question 457:

  Which method of advertising networks from an autonomous system into BGP can result in the most instability?

  A. Using the network command
  B. Redistributing static routes into BGP
  C. Redistributing dynamic routes into BGP
  D. Redistributing static routes into IBGP
  C. Redistributing dynamic routes into BGP

  ---

  Redistributing dynamic IGP routes into BGP can result in instability, and is not recommended.

  Dynamic routes can disappear from the routing table, and even flap up and down constantly if there are link problems, especially with WAN links. If the networks are redistributed into BGP, their flapping can result in BGP updates about the route changing status, resulting in instability for BGP.

  Most ISPs guard against unstable routes and might threaten to cut off your BGP connectivity if you have flapping routes that cause BGP instability in their networks.

  The network command and redistributed static routes, on the other hand, tend not to change state so often. As a result, they are considered much more stable from a BGP perspective.

  Objective:

  Layer 3 Technologies

  Sub-Objective:

  Configure and verify manual and autosummarization with any routing protocol

  References:

  Cisco > Support > Technology Support > IP > IP Routing > Design > Design Technotes > BGP Case Studies > Document ID: 26634 > Redistribution

• Question 458:

  When provisioning a device in Cisco DNA Center, the engineer sees the error message "Cannot select the device. Not compatible with template". What is the reason for the error?

  A. The template has an incorrect configuration.
  B. The software version of the template is different from the software version of the device.
  C. The changes to the template were not committed.
  D. The tag that was used to filter the templates does not match the device tag.
  D. The tag that was used to filter the templates does not match the device tag.

  ---

  If you use tags to filter the templates, you must apply the same tags to the device to which you want to apply the templates. Otherwise, you get the following error during provisioning: Cannot select the device. Not

  https://www.cisco.com/c/en/us/td/docs/cloud-systems-management/network-automation-and-management/dna-center/1-2-10/user_guide/b_cisco_dna_center_ug_1_2_10/b_dnac_ug_1_2_10_chapter_0111.html

• Question 459:

  Refer to the exhibit.

  

  Which configuration resolves the IP SLA issue from R1 to the server?

  A. R6(config)#ip sla responder
  B. R6(config)#ip sla responder udp-echo ipaddress 10.60.60.6 po 5000
  C. R6(config)#ip sla 650 R6(config-ip-sla)ff udp-jitter 10.60.60.6
  D. R6(config)#ip sla schedule 10 life forever start-time now
  A. R6(config)#ip sla responder

• Question 460:

  Consider the partial output of the show ip bgp command:

  

  Which of the following statements are TRUE about the given output? (Choose all that apply.)

  A. The 10.62.7.0 route is learned by the router through an iBGP neighbor.
  B. All five routes have been originated by an IGP.
  C. The router is aware of the best path for the 61.80.3.0 destination.
  D. There are four AS between the router and the 192.177.1.0 subnet.
  A. The 10.62.7.0 route is learned by the router through an iBGP neighbor.
  B. All five routes have been originated by an IGP.

  ---

  The following statements are TRUE about the given output:

  The 10.62.7.0 route is learned by the router through an iBGP neighbor.

  All five routes have been originated by an IGP.

  The show ip bgp command displays information about the BGP routing table, including origin type, metric, next-hop addresses for every route learned by BGP, router ID, local preference, and BGP path. In the output, the character i in the first entry of the 10.62.7.0 destination indicates that the route was learned by an iBGP neighbor. The * symbol at the beginning of the routes indicate that they are valid routes, while the > symbol indicate that the route is the current best route.

  The i at the end of the entries under the Path column indicates that the routes have been originated by an interior gateway protocol (IGP). In the scenario output, all five routes have an i at the end of their respective entries. If the character e appears as the origin code, the routes are considered to have originated from an exterior gateway protocol (EGP). The origin code can also be the ? character, which implies that the origin of the route is unknown.

  The output also displays the next-hop addresses for the routes. The 200.7.34.0 subnet is a local route, and hence has its next-hop address as 0.0.0.0.

  The show ip bgp command also displays the local router's ID (RID), local preference, weight, and next-hop addresses for every route learned by BGP. In this case, the RID of RouterA is 200.17.34.15 and the local preference, weight, and next-hop address for the 10.62.7.0 network are 100, 0, and 10.62.7.78, respectively. The metric and the next-hop address for the BGP routes can also be viewed by using the show ip route bgp command, as follows:

  RouterA# show ip route bgp

  B 10.62.7.0 [200/0] via 10.62.7.78, 01:34:16

  B 200.17.56.0 [200/0] via 10.62.7.78, 01:34:16

  B 192.177.1.0 [20/100] via 10.62.7.115, 01:34:16

  The BGP table version can also be displayed by using the show ip bgp neighbors and the show ip bgp summary commands. The show ip bgp neighbors command also displays the address, ASN, and RID of neighbors of the local router, as shown below:

  RouterA# show ip bgp neighbors

  BGP neighbor is 192.177.1.6, remote AS 200, external link

  BGP version 17, remote router ID 200.17.34.15

  BGP state = Established, table version = 16, up for 01:45:03

  The show ip bgp summary command displays the RID and the BGP table version, as shown in the following output:

  RouterA# show ip bgp summary

  BGP router identifier 200.17.34.15, local AS number 100

  BGP table version is 17, main routing table version 18

  Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 10.62.7.90 17 200 56 55 18 0 0 01:42:13 27

  10.62.7.145 17 300 34 33 18 0 0 00:31:20 0

  The router is not aware of the best path for the 61.80.3.0 route. The character h appears at the beginning of the entry for the 61.80.30 destination. This means that the route is in the history state currently and that the best route is not known.

  There are not four AS between the router and the 192.177.1.0 subnet. In the output, the Path column for the 192.1771.1.0 subnet lists four AS numbers. The four AS numbers refer to the ASNs traversed by the route from RouterA to the 192.177.1.0 subnet. The first AS refers to the first neighbor of RouterA; the second AS refers to the neighbor of the first neighbor; and so on. The last AS in the column is the AS of the 192.177.1.0. This implies that there are three AS (1, 2, and 3) that exist between RouterA

  and the subnet.

  Objective:

  Layer 3 Technologies

  Sub-Objective:

  Configure and verify eBGP (IPv4 and IPv6 address families)

  References:

  Cisco > Cisco IOS IP Routing: BGP Command Reference > show ip bgp Cisco > Cisco IOS IP Routing: BGP Command Reference > show ip route bgp Cisco > Cisco IOS IP Routing: BGP Command Reference > show ip bgp summary