300-410 Device Management Practice Test 4 — 15 Questions

Question 1

A network engineer runs the following command to troubleshoot an MPLS LDP issue:

R1# debug mpls ldp transport
LDP: Transport connection to 2.2.2.2:0 via TCP (passive)
LDP: Connection from 2.2.2.2:0 to 1.1.1.1:646
LDP: Transport connection to 2.2.2.2:0 via TCP (active)
LDP: Connection from 1.1.1.1:646 to 2.2.2.2:0
LDP: Hold timer expired for peer 2.2.2.2:0
LDP: Closing transport connection to 2.2.2.2:0

What does this output indicate?

Accepted Answer

LDP session is flapping due to hold timer expiration.. The debug shows that the LDP transport connection to peer 2.2.2.2 is established but then the hold timer expires, causing the connection to close. This indicates a problem with LDP keepalive or session maintenance.

Answer

LDP session is established and stable.

Answer

LDP session is down because of authentication failure.

Answer

LDP session is down because of a transport address mismatch.

Question 2

A network engineer runs the following command to troubleshoot DMVPN NHRP:

R1# debug nhrp
NHRP: Registration request sent to 10.0.0.1 via GigabitEthernet0/0
NHRP: Registration reply received from 10.0.0.1
  Holding time: 3600 sec
  Flags: 0x0000
NHRP: Cache added 10.1.1.1/32 via 10.0.0.1, non-caching

What does this output indicate?

Accepted Answer

NHRP registration to the hub is successful.. The debug shows that the router sent an NHRP registration request to the hub (10.0.0.1) and received a reply, indicating successful registration. A cache entry is added for the spoke's tunnel IP.

Answer

NHRP registration failed because no reply was received.

Answer

NHRP registration is pending due to authentication failure.

Answer

NHRP registration is rejected by the hub.

Question 3

A network engineer runs the following command to troubleshoot IPsec IKE phase 1:

R1# debug crypto isakmp
ISAKMP: (0:0:N/A:0) Starting aggressive mode exchange
ISAKMP: (0:0:N/A:0) processing SA payload
ISAKMP: (0:0:N/A:0) Checking ISAKMP transform 1 against priority 1 policy
ISAKMP: (0:0:N/A:0) encryption 3DES
ISAKMP: (0:0:N/A:0) hash SHA
ISAKMP: (0:0:N/A:0) group 2
ISAKMP: (0:0:N/A:0) auth pre-share
ISAKMP: (0:0:N/A:0) life type in seconds
ISAKMP: (0:0:N/A:0) life duration (basic) of 86400
ISAKMP: (0:0:N/A:0) atts are not acceptable

What does this output indicate?

Accepted Answer

IKE phase 1 fails due to transform set mismatch.. The debug shows that during IKE phase 1, the router checks the received transform set but finds the attributes not acceptable. This indicates a mismatch in IKE policies between peers.

Answer

IKE phase 1 is successful; the transform set is accepted.

Answer

IKE phase 1 fails due to authentication failure.

Answer

IKE phase 1 fails due to lifetime mismatch.

Question 4

A network engineer runs the following command to troubleshoot Control Plane Policing (CoPP):

R1# show policy-map control-plane input class class-default
  Class-map: class-default (match-any)
    140091 packets, 12345678 bytes
    5 minute offered rate 1000 bps, drop rate 0 bps
    Match: any
    police:
        cir 8000 bps, bc 1500 bytes
        conformed 140091 packets, 12345678 bytes; actions:
          transmit
        exceeded 0 packets, 0 bytes; actions:
          drop
        violated 0 packets, 0 bytes; actions:
          drop

What does this output indicate?

Accepted Answer

CoPP is rate-limiting traffic to 8000 bps and not dropping any packets.. The output shows that the CoPP policy on the control-plane input class-default is policing traffic to 8000 bps. All packets are conforming and being transmitted, with no drops.

Answer

CoPP is dropping all traffic to the control plane.

Answer

CoPP is not configured; the class-default shows no action.

Answer

CoPP is dropping packets due to exceeding the rate.

Question 5

A network engineer runs the following command to troubleshoot a VRF route issue:

R1# show ip route vrf CUSTOMER summary
IP routing table name is CUSTOMER (0x1)
IP routing table maximum-paths is 32
Route Source    Networks    Subnets    Overhead    Memory (bytes)
connected       2           0          0           320
static          1           0          0           160
eigrp 100       3           0          0           480
  Internal      3
Total           6           0          0           960

What does this output indicate?

Accepted Answer

The VRF CUSTOMER routing table has 6 routes, including static and EIGRP routes.. The output shows the routing table summary for VRF CUSTOMER, with 6 total routes: 2 connected, 1 static, and 3 EIGRP routes. No red flags are present.

Answer

The VRF CUSTOMER routing table is empty.

Answer

The VRF CUSTOMER has only connected routes.

Answer

The VRF CUSTOMER routing table has an error due to overlapping subnets.

Question 6

What is the default OSPF dead interval on a point-to-point network when the hello interval is set to 10 seconds?

Accepted Answer

40 seconds. By default, the OSPF dead interval is four times the hello interval. On point-to-point networks, the default hello interval is 10 seconds, so the dead interval is 40 seconds.

Answer

10 seconds

Answer

20 seconds

Answer

30 seconds

Question 7

Which statement correctly describes the default behavior of EIGRP auto-summary on Cisco IOS-XE?

Accepted Answer

Auto-summary is disabled by default, so subnets are advertised without summarization.. In modern Cisco IOS-XE releases (15.x and later), EIGRP auto-summary is disabled by default. This changed from older IOS versions where auto-summary was enabled by default.

Answer

Auto-summary is enabled by default, summarizing classful boundaries.

Answer

Auto-summary is enabled only for EIGRP named mode configurations.

Answer

Auto-summary is disabled by default, but only for IPv6 EIGRP.

Question 8

Which OSPF LSA type is used to describe a default route injected into a regular area by an Area Border Router (ABR)?

Accepted Answer

Type 3 (Summary LSA). Type 3 LSAs are summary LSAs generated by ABRs to advertise networks from one area to another. When an ABR injects a default route into a regular area, it uses a Type 3 LSA with a destination of 0.0.0.0.

Answer

Type 1 (Router LSA)

Answer

Type 2 (Network LSA)

Answer

Type 5 (AS-External LSA)

Question 9

What is the default EIGRP composite metric formula used for route calculation?

Accepted Answer

metric = (K1 * bandwidth) + (K3 * delay). The default EIGRP metric formula uses bandwidth and delay only: metric = (K1 * bandwidth) + (K3 * delay). By default, K1=1, K3=1, and K2, K4, K5 are set to 0, so load and reliability are ignored.

Answer

metric = bandwidth + delay + load + reliability

Answer

metric = bandwidth + delay + MTU

Answer

metric = (K1 * bandwidth) + (K2 * load) + (K3 * delay) + (K5 / (K4 + reliability))

Question 10

Which BGP attribute is used as the first tie-breaker when multiple paths are available for the same prefix, assuming default settings?

Accepted Answer

Weight. The BGP best-path selection process uses the highest weight (Cisco proprietary) as the first tie-breaker. Weight is locally significant and defaults to 0 for routes learned from peers.

Answer

Local preference

Answer

AS-path length

Answer

MED (Multi-Exit Discriminator)

Question 11

What is the default OSPF network type for a serial interface configured with HDLC encapsulation on Cisco routers?

Accepted Answer

Point-to-point. By default, Cisco IOS sets serial interfaces with HDLC or PPP encapsulation to OSPF network type point-to-point. This is because these encapsulations typically indicate a direct link between two routers.

Answer

Broadcast

Answer

Non-broadcast (NBMA)

Answer

Point-to-multipoint

Question 12

Which EIGRP packet type is used to confirm receipt of an update during reliable transport?

Accepted Answer

ACK. EIGRP uses Reliable Transport Protocol (RTP). When a router receives an update, it sends an ACK packet (a hello packet with no data) to confirm receipt. ACKs are always sent unreliably (unicast).

Answer

Hello

Answer

Update

Answer

Query

Question 13

What is the default administrative distance for OSPF routes in Cisco IOS?

Accepted Answer

110. The default administrative distance for OSPF is 110. This is a Cisco IOS default value used when comparing routes from different routing protocols.

Answer

90

Answer

100

Answer

120

Question 14

Which loop prevention mechanism does RIP use to avoid routing loops?

Accepted Answer

Maximum hop count of 15. RIP uses multiple loop prevention mechanisms, including maximum hop count (15), split horizon, route poisoning, and hold-down timers. The maximum hop count of 15 (with 16 considered infinite) is a fundamental loop prevention method.

Answer

TTL expiration in IP header

Answer

DUAL algorithm

Answer

LSA aging

Question 15

Drag and drop the steps to enable and verify RESTCONF on IOS-XE into the correct order, from first to last.

Accepted Answer

Enable the HTTPS server using ip http secure-server. RESTCONF requires enabling the HTTPS server first, then the RESTCONF service, followed by authentication configuration, verifying the interface, and finally testing via a REST client.