300-410 Practice Test 22 — 15 Questions

Question 1

A network engineer runs the following command on Router R1:

R1# show ip vrf detail RED
VRF RED (VRF Id = 1); default RD <not set>
   Interfaces:
           GigabitEthernet0/2
           Loopback1
   Address family IPV4 (Table ID = 1):
      No Export VPN route-target communities
      No Import VPN route-target communities
      No import route-map
      No export route-map
      VRF label distribution protocol: not configured
   Address family IPV6 (Table ID = 0x1E000001):
      No Export VPN route-target communities
      No Import VPN route-target communities
      No import route-map
      No export route-map
      VRF label distribution protocol: not configured

Based on this output, which statement is correct?

Accepted Answer

The VRF RED includes two interfaces: GigabitEthernet0/2 and Loopback1.. The 'show ip vrf detail RED' command shows detailed VRF information. It lists interfaces GigabitEthernet0/2 and Loopback1. The RD is not set, which is common for VRF-Lite (no MPLS). There are no route-target communities, which is expected for VRF-Lite.

Answer

The VRF RED has a Route Distinguisher configured.

Answer

The VRF RED has an export route-map configured.

Answer

The VRF RED is configured for MPLS label distribution.

Question 2

Which EIGRP packet type is used to confirm receipt of an update during reliable transport in a VRF-Lite configuration?

Accepted Answer

ACK. EIGRP uses ACK packets, which are hello packets with no data, to acknowledge reliable packets (updates, queries, replies).

Answer

Hello

Answer

Update

Answer

Query

Question 3

Which of the following is true regarding the use of prefix-lists versus access-lists for route filtering?

Accepted Answer

Prefix-lists can match on both network address and prefix length, while access-lists match only on network address.. Prefix-lists are designed specifically for route filtering and can match on prefix length using ge and le operators. Access-lists match on source/destination IP and wildcard mask but do not have the ability to specify prefix length ranges. Prefix-lists are more efficient and flexible for route filtering.

Answer

Access-lists can match on prefix length using the 'ge' and 'le' keywords.

Answer

Access-lists are more efficient than prefix-lists for route filtering.

Answer

Prefix-lists can only be used with BGP, while access-lists can be used with any protocol.

Question 4

Which THREE symptoms indicate a misconfiguration in a VRF-Lite deployment where two routers are connected via a trunk link and each VRF should have connectivity? (Choose THREE.)

Accepted Answer

Pings between hosts in the same VRF across the trunk link fail.. Common symptoms include: pings failing between devices in the same VRF across the link, missing routes in the VRF routing table, and the VRF interface showing up/down due to misconfiguration. The incorrect options: a default route in the global table is not a VRF-Lite symptom; high CPU is not specific to VRF-Lite.

Answer

The global routing table contains a default route pointing to the ISP.

Answer

The router CPU utilization is consistently above 90%.

Question 5

Which TWO configuration steps are required to filter routes using a prefix-list in a route-map applied to a BGP neighbor? (Choose TWO.)

Accepted Answer

Configure a prefix-list with permit or deny statements for the desired prefixes.. To filter routes, you must define the prefix-list to match the desired prefixes, then create a route-map that uses the prefix-list in a match statement. The route-map is then applied to the BGP neighbor. Defining an access-list is an alternative but not required if using a prefix-list. The 'network' command under BGP is for originating routes, not filtering. The 'distribute-list' command is a separate method and does not use a route-map.

Answer

Define an extended access-list to match the prefixes.

Answer

Apply the route-map to the BGP neighbor using the 'neighbor x.x.x.x route-map' command.

Answer

Use the 'network' command under BGP to advertise the filtered routes.

Question 6

A network engineer runs the following command to troubleshoot a VRF-Lite OSPF adjacency issue:

R1# debug ip ospf adj vrf CUSTOMER_C

Output:
OSPF: 2 Way state received from 10.1.1.2 on interface GigabitEthernet0/1, address 10.1.1.2
OSPF: Neighbor 10.1.1.2 is eligible for DR election on interface GigabitEthernet0/1
OSPF: DR election: 10.1.1.1 (pri 1) is DR, 10.1.1.2 (pri 1) is BDR
OSPF: Build router LSA for area 0, router ID 1.1.1.1, seq 0x80000001
OSPF: Neighbor 10.1.1.2 is FULL, state changed from LOADING to FULL

What does this output indicate?

Accepted Answer

The OSPF adjacency formed successfully, with 10.1.1.1 as DR and 10.1.1.2 as BDR.. The 'debug ip ospf adj vrf' command shows OSPF adjacency state changes for a specific VRF. The output shows a successful OSPF adjacency formation: the neighbor transitioned through 2-Way, DR election, and reached FULL state. The router with IP 10.1.1.1 became the DR, and 10.1.1.2 became the BDR.

Answer

The OSPF adjacency failed because the neighbor remained in LOADING state.

Answer

The OSPF adjacency formed but the router ID is missing, causing instability.

Answer

The OSPF adjacency is stuck in 2-Way state due to mismatched area IDs.

Question 7

In OSPF, what is the default hello interval on a point-to-point network type?

Accepted Answer

10 seconds. OSPF default hello interval is 10 seconds for broadcast and point-to-point networks, and 30 seconds for NBMA networks. This is defined in RFC 2328.

Answer

30 seconds

Answer

5 seconds

Answer

40 seconds

Question 8

An engineer configures a route map to filter BGP routes based on AS-path using a regex. The route map is applied inbound to an eBGP neighbor. The engineer notices that routes with an AS-path containing the neighbor's AS are still being accepted. Which is the most likely explanation?

Accepted Answer

The AS-path is prepended with the local AS before the inbound route map is applied, so the regex does not match the original AS-path.. When an eBGP route is received, the router prepends its own AS to the AS-path before the route map is applied. Therefore, if the route map is trying to match the neighbor's AS in the AS-path, it will fail because the neighbor's AS is now the first AS in the path. The edge case is that the AS-path is modified before the route map is processed.

Answer

The route map is applied outbound instead of inbound.

Answer

The regex is incorrect; it should use _AS_ to match the AS number.

Answer

The neighbor is configured with 'send-community' which overrides the route map.

Question 9

Given the following partial configuration on router R1:

ip sla 10
 icmp-echo 192.168.1.1 source-ip 10.0.0.1
 frequency 10
ip sla schedule 10 life forever start-time now

Which statement best describes the effect of this configuration?

Accepted Answer

It sends ICMP echo requests from 10.0.0.1 to 192.168.1.1 every 10 seconds.. The configuration creates an IP SLA operation that sends ICMP echo probes to 192.168.1.1 every 10 seconds, using source IP 10.0.0.1. The schedule starts immediately and runs indefinitely.

Answer

It sends ICMP echo requests from 192.168.1.1 to 10.0.0.1 every 10 seconds.

Answer

It sends ICMP echo requests every 10 seconds but only after the first successful reply.

Answer

It sends ICMP echo requests only once and then stops.

Question 10

Given this IP SLA configuration on router R4:

ip sla 40
 icmp-echo 10.10.10.1 source-ip 172.16.1.1
 frequency 15
ip sla schedule 40 life forever start-time now

Which statement is true?

Accepted Answer

The source IP 172.16.1.1 must be configured on an interface of R4.. The configuration sends ICMP echo probes from 172.16.1.1 to 10.10.10.1 every 15 seconds. The source IP is explicitly set.

Answer

The source IP 172.16.1.1 can be any IP address, even if not local.

Answer

The operation will fail because frequency 15 is too high.

Answer

The operation will use TCP instead of ICMP.

Question 11

Examine this IP SLA configuration on router R5:

ip sla 50
 icmp-echo 10.20.20.1 source-ip 192.168.10.1
 frequency 10
ip sla schedule 50 life forever start-time now

What is the effect of this configuration?

Accepted Answer

It will continuously monitor reachability to 10.20.20.1 from source 192.168.10.1.. The configuration creates an IP SLA operation that sends ICMP echo probes to 10.20.20.1 every 10 seconds, using source IP 192.168.10.1. It starts immediately and runs forever.

Answer

It will stop after 10 successful replies.

Answer

It will measure jitter between the two IPs.

Answer

It will only work if 10.20.20.1 is directly connected.

Question 12

Which THREE symptoms indicate that EIGRP is experiencing a neighbor relationship issue due to an MTU mismatch? (Choose THREE.)

Accepted Answer

The neighbor adjacency repeatedly goes up and down.. An MTU mismatch causes EIGRP packets to be fragmented or dropped, leading to repeated adjacency flaps as the neighbor relationship is re-established each time the hold timer expires. This instability is a classic symptom of MTU mismatch in EIGRP.

Answer

The 'show ip eigrp topology' command shows routes in active state.

Answer

The 'show ip eigrp interfaces' command shows a hold time of zero.

Question 13

What is the default maximum number of paths that BGP can install in the routing table using the 'maximum-paths' command in Cisco IOS?

Accepted Answer

1. By default, BGP installs only one best path (maximum-paths 1). This can be increased to allow load balancing, but the default is 1.

Answer

2

Answer

4

Answer

6

Question 14

What is the default timeout value (in milliseconds) for an IP SLA operation?

Accepted Answer

5000 ms. The default timeout for IP SLA operations is 5000 milliseconds (5 seconds). If no response is received within this time, the probe is considered failed.

Answer

1000 ms

Answer

10000 ms

Answer

60000 ms

Question 15

According to Cisco IOS default behavior, if a router learns the same route via both RIP and OSPF, which route will be installed in the routing table?

Accepted Answer

The OSPF route, because OSPF has a lower administrative distance.. OSPF has a default AD of 110, RIP has 120. Lower AD is preferred, so OSPF route is installed.

Answer

The RIP route, because RIP has a lower metric.

Answer

Both routes are installed, and load balancing occurs.

Answer

Neither route is installed; the router will use a default route.