300-410 Practice Test 48 — 15 Questions

Question 1

A network engineer runs the following command to troubleshoot a Network Logging and Syslog issue:

R1# show crypto engine connections active

Output:
Crypto Engine Connections

ID  Type              Algorithm           State       Connection-ID
    1  IPsec             AES256-SHA         Active      100
    2  IPsec             AES256-SHA         Active      101
    3  ISAKMP            SHA                 Active      200

What does this output indicate?

Accepted Answer

The router has two active IPsec tunnels and one active ISAKMP session.. The output shows active crypto engine connections, including IPsec and ISAKMP sessions. This indicates that the router is processing encrypted traffic.

Answer

The router is experiencing IPsec authentication failures.

Answer

The router has no active crypto connections.

Answer

The router is using only IPsec and no ISAKMP.

Question 2

A network engineer runs the following command to troubleshoot OSPFv3 adjacency:

R1# debug ipv6 ospf adj
*Mar  1 00:15:23.456: OSPFv3-1-IPv6 ADJ   Gi0/0: Rcv pkt from 2001:DB8:1::2, src 2001:DB8:1::2, area 0
*Mar  1 00:15:23.457: OSPFv3-1-IPv6 ADJ   Gi0/0: Nbr 2.2.2.2: Our address 2001:DB8:1::1, his address 2001:DB8:1::2
*Mar  1 00:15:23.458: OSPFv3-1-IPv6 ADJ   Gi0/0: Nbr 2.2.2.2: Neighbor is not DR, state 2WAY
*Mar  1 00:15:23.459: OSPFv3-1-IPv6 ADJ   Gi0/0: Nbr 2.2.2.2: DR is 2001:DB8:1::2, BDR is 2001:DB8:1::1
*Mar  1 00:15:23.460: OSPFv3-1-IPv6 ADJ   Gi0/0: Nbr 2.2.2.2: Build the Start DBD
*Mar  1 00:15:23.462: OSPFv3-1-IPv6 ADJ   Gi0/0: Nbr 2.2.2.2: Master/Slave negotiation done
*Mar  1 00:15:23.464: OSPFv3-1-IPv6 ADJ   Gi0/0: Nbr 2.2.2.2: Exchange done, loading started
*Mar  1 00:15:23.466: OSPFv3-1-IPv6 ADJ   Gi0/0: Nbr 2.2.2.2: Loading done
*Mar  1 00:15:23.468: OSPFv3-1-IPv6 ADJ   Gi0/0: Nbr 2.2.2.2: Full

What does this output indicate?

Accepted Answer

The OSPFv3 adjacency formed successfully between routers with router IDs 1.1.1.1 and 2.2.2.2.. The debug output shows the successful OSPFv3 adjacency formation between two routers on interface Gi0/0.

Answer

The OSPFv3 adjacency failed due to area mismatch.

Answer

The adjacency is stuck in Exstart state due to interface MTU mismatch.

Answer

The router is the DR on this segment.

Question 3

A network engineer runs the following command to verify OSPFv3 database:

R1# show ipv6 ospf database router 2.2.2.2

OSPFv3 Router with ID (1.1.1.1) (Process ID 1)

Router Link States (Area 0)

LS age: 60
  LS Type: Router Links
  Link State ID: 0.0.0.0
  Advertising Router: 2.2.2.2
  LS Seq Number: 80000003
  Checksum: 0x5678
  Length: 40
  Number of Links: 1

Link connected to: a Transit Network
     (Link ID) Interface ID: 2
     (Link Data) Neighbor Interface ID: 1
      Number of TOS metrics: 0
       TOS 0 Metrics: 10

What does this output indicate?

Accepted Answer

The LSA indicates a single transit link with interface IDs, typical for OSPFv3.. The output shows an OSPFv3 Router LSA from router 2.2.2.2 with one link to a transit network, using interface IDs instead of IP addresses.

Answer

The LSA shows a link to a stub network with prefix information.

Answer

The advertising router is 1.1.1.1.

Answer

This is a Type 5 External LSA.

Question 4

A network engineer runs the following command to troubleshoot OSPF neighbor states:

R1# show ip ospf neighbor detail
 Neighbor 2.2.2.2, interface address 10.1.1.2
    In the area 0 via interface GigabitEthernet0/0
    Neighbor priority is 1, State is FULL, 6 state changes
    DR is 10.1.1.2, BDR is 10.1.1.1
    Options is 0x42 (LLS, DC)
    LLS Options is 0x1 (LR)
    Dead timer due in 00:00:36
    Neighbor is up for 00:12:34
    Index 1/1/1
    Retransmission queue length 0, number of retransmission 1
    First 0x0(0)/0x0(0)/0x0(0) Next 0x0(0)/0x0(0)/0x0(0)
    Last retransmission scan length is 1, maximum is 1
    Last retransmission scan time is 0 msec, maximum is 0 msec

What does this output indicate?

Accepted Answer

The neighbor is the DR and the adjacency is fully established.. The output shows detailed OSPF neighbor information, including state, DR/BDR roles, and timers.

Answer

The neighbor is in the 2WAY state and not fully adjacent.

Answer

There is a retransmission queue issue causing packet loss.

Answer

The neighbor is not participating in DR/BDR election.

Question 5

A network engineer runs the following command to troubleshoot OSPF route installation:

R1# show ip route ospf
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set

O    10.1.1.0/24 [110/10] via 10.1.1.2, 00:12:34, GigabitEthernet0/0
O IA 192.168.1.0/24 [110/20] via 10.1.1.2, 00:10:00, GigabitEthernet0/0
O E2 5.5.5.5/32 [110/20] via 10.1.1.2, 00:05:00, GigabitEthernet0/0

What does this output indicate?

Accepted Answer

All OSPF routes are learned from the same next-hop 10.1.1.2.. The output shows OSPF routes in the routing table, including intra-area, inter-area, and external routes.

Answer

The route to 5.5.5.5/32 is an intra-area route.

Answer

The route to 192.168.1.0/24 is a directly connected network.

Answer

The router has a default route installed.

Question 6

Which LSA type is used by OSPF to advertise prefixes from other routing protocols (redistribution) and has a default metric of 20?

Accepted Answer

Type 5 LSA (AS-external LSA). Type 5 AS-external LSAs are used to advertise external routes redistributed into OSPF. The default metric for these LSAs is 20, as defined by Cisco IOS.

Answer

Type 1 LSA (Router LSA)

Answer

Type 3 LSA (Summary LSA)

Answer

Type 4 LSA (ASBR Summary LSA)

Question 7

Which OSPF network type defaults to a hello interval of 30 seconds and a dead interval of 120 seconds on Cisco IOS?

Accepted Answer

Non-Broadcast (NBMA). The Non-Broadcast Multi-Access (NBMA) network type uses a default hello interval of 30 seconds and a dead interval of 120 seconds, as per Cisco implementation.

Answer

Broadcast

Answer

Point-to-point

Answer

Point-to-multipoint

Question 8

In OSPFv3, which authentication method is supported by default?

Accepted Answer

IPsec authentication. OSPFv3 uses IPsec for authentication and encryption, as defined in RFC 4552. It does not support the simple password or MD5 authentication used in OSPFv2.

Answer

MD5 authentication

Answer

Simple password authentication

Answer

No authentication is supported

Question 9

What is the default OSPF reference bandwidth used in the metric calculation on Cisco IOS-XE?

Accepted Answer

100 Mbps. Cisco IOS-XE uses a default reference bandwidth of 100 Mbps for OSPF metric calculation (cost = reference bandwidth / interface bandwidth).

Answer

1000 Mbps

Answer

10 Mbps

Answer

10000 Mbps

Question 10

A network engineer runs the following command to troubleshoot a Network Logging and Syslog issue:

R1# show policy-map control-plane input class class-default

Output:
  Class-map: class-default (match-any)
    0 packets, 0 bytes
    5 minute offered rate 0 bps, drop rate 0 bps
    Match: any
    police:
        cir 1000000 bps, bc 31250 bytes
        conformed 0 packets, 0 bytes; actions:
            transmit
        exceeded 0 packets, 0 bytes; actions:
            drop
        violated 0 packets, 0 bytes; actions:
            drop

What does this output indicate?

Accepted Answer

The CoPP policy is policing control plane traffic at 1 Mbps, but no packets have been matched yet.. The output shows the CoPP policy for the control plane, with a policer that limits traffic to 1 Mbps. The counters show no traffic has been matched, which may indicate that the policy is not effective or no traffic is hitting the control plane.

Answer

The CoPP policy is dropping all control plane traffic.

Answer

The CoPP policy is not applied to the control plane.

Answer

The CoPP policy is using a class-map that matches all traffic.

Question 11

What is the default size of the logging buffer in Cisco IOS-XE when 'logging buffered' is enabled without specifying a size?

Accepted Answer

4096 bytes. The default logging buffer size is 4096 bytes (4 KB) on most Cisco IOS-XE platforms.

Answer

1024 bytes

Answer

8192 bytes

Answer

16384 bytes

Question 12

Which OSPF LSA type is flooded only within the originating area and is used for loop prevention by describing the topology of the area?

Accepted Answer

Type 1 LSA (Router LSA). Type 1 Router LSAs describe the router's links and are flooded only within the area. They provide topology information for loop prevention within the area.

Answer

Type 2 LSA (Network LSA)

Answer

Type 3 LSA (Summary LSA)

Answer

Type 4 LSA (ASBR Summary LSA)

Question 13

What is the default logging severity level for messages sent to the console in Cisco IOS-XE?

Accepted Answer

Level 7 (debugging). By default, Cisco IOS-XE logs messages with severity level 7 (debugging) and higher to the console.

Answer

Level 0 (emergencies)

Answer

Level 5 (notifications)

Answer

Level 4 (warnings)

Question 14

In OSPF, what is the default behavior for auto-summary on Cisco IOS-XE?

Accepted Answer

Auto-summary is disabled by default. Cisco IOS-XE has auto-summary disabled by default for OSPF, meaning that redistributed routes are not summarized to their classful boundaries unless explicitly configured.

Answer

Auto-summary is enabled by default

Answer

Auto-summary is only enabled for external routes

Answer

Auto-summary is enabled only for inter-area routes

Question 15

According to RFC 5424, which syslog severity level corresponds to 'Critical' conditions?

Accepted Answer

Severity 2. RFC 5424 defines severity level 2 as 'Critical' conditions.

Answer

Severity 0

Answer

Severity 1

Answer

Severity 3