300-410 Practice Test 32 — 15 Questions

Question 1

Given the following partial configuration on router R5:

interface GigabitEthernet0/0
 ip address 10.1.1.1 255.255.255.0
 ip pim sparse-mode
!
interface GigabitEthernet0/1
 ip address 10.2.2.1 255.255.255.0
 ip pim sparse-mode
!
router ospf 1
 router-id 5.5.5.5
 network 10.0.0.0 0.255.255.255 area 0

What is the effect of this configuration?

Accepted Answer

OSPF will form adjacencies on both interfaces, and PIM sparse-mode will operate normally; the configuration is valid.. The configuration is valid because OSPF and PIM sparse-mode operate independently on an interface. OSPF uses multicast address 224.0.0.5/6 for hello packets and forms adjacencies regardless of PIM sparse-mode being enabled. PIM sparse-mode requires an RP to function, but its presence does not affect OSPF adjacency formation. The network statement 10.0.0.0 0.255.255.255 matches both interfaces (10.1.1.1 and 10.2.2.1), so OSPF will form adjacencies on both.

Answer

OSPF will not form adjacencies because PIM sparse-mode is enabled on the interfaces.

Answer

OSPF will only form adjacency on GigabitEthernet0/0 because the network statement does not match GigabitEthernet0/1.

Answer

PIM sparse-mode will not work because there is no rendezvous point (RP) configured.

Question 2

Which TWO commands verify the application and content of an IPv4 access control list on a Cisco IOS router? (Choose TWO.)

Accepted Answer

show ip interface. The 'show ip interface' command displays the access lists applied to an interface, including the direction (inbound/outbound) and the specific ACL name or number. The 'show access-lists' command shows the detailed content of all ACLs, including the exact permit/deny statements, sequence numbers, and hit counts, verifying both the application and the rules.

Answer

show running-config | include access-list

Answer

show ip route

Answer

debug ip packet

Question 3

An engineer is troubleshooting a router that fails to write its running configuration to startup configuration using 'copy running-config startup-config'. The command returns 'Destination filename [startup-config]?' and then the prompt returns without error. 'show startup-config' shows an empty configuration. What is the most likely cause?

Accepted Answer

The router is configured to boot from a TFTP server using the 'boot host' command, and the TFTP server is unreachable or does not allow writes.. The 'copy running-config startup-config' command prompts for the destination filename and then returns without error, but the startup configuration remains empty. This behavior occurs when the router is configured to boot from a TFTP server using the 'boot host' command, and the TFTP server is unreachable or does not allow writes. The router attempts to write the configuration to the TFTP server instead of NVRAM, and if the TFTP server is not reachable or write access is denied, the command appears to succeed but the configuration is not saved.

Answer

The NVRAM is full and the router cannot save the configuration.

Answer

The 'file prompt quiet' command is configured, suppressing prompts.

Answer

The router is running in ROMMON mode.

Question 4

A network engineer is troubleshooting a redistribution issue between OSPF and EIGRP. Router R1 redistributes OSPF into EIGRP, and Router R2 redistributes EIGRP into OSPF. After configuration, some routes are missing, and routing loops occur. R1 has: router eigrp 100 redistribute ospf 1 metric 10000 100 255 1 1500 route-map OSPF-to-EIGRP. R2 has: router ospf 1 redistribute eigrp 100 subnets route-map EIGRP-to-OSPF. Show ip route on R1 shows an OSPF route 172.16.1.0/24 learned via R2, but also an EIGRP route for the same prefix with a better administrative distance. What is the root cause?

Accepted Answer

The route-map OSPF-to-EIGRP on R1 should include a match clause to filter out routes learned from R2 via OSPF, preventing feedback.. The route-map OSPF-to-EIGRP on R1 is not filtering out the OSPF route 172.16.1.0/24 that was originally redistributed from EIGRP into OSPF by R2. This creates a routing feedback loop: R1 learns the prefix via OSPF (from R2) and then redistributes it back into EIGRP, causing R2 to see an EIGRP route with a better administrative distance (90 vs. 110) and prefer it, leading to missing routes and loops. The route-map should include a match clause to deny routes that were originally EIGRP (e.g., via a tag or prefix-list) to prevent mutual redistribution.

Answer

The redistribute command on R2 should have a metric-type 1 to avoid suboptimal routing.

Answer

The administrative distance of OSPF should be changed to 85 on R1 to prefer OSPF over EIGRP.

Answer

The EIGRP metric on R1 should be set to a higher value to make the redistributed route less preferred.

Question 5

Drag and drop the steps to verify and validate the operational state of an IPv6 tunneling technique into the correct order, from first to last.

Accepted Answer

Check tunnel interface status with 'show interfaces tunnel0'. Validation follows a systematic approach: start with checking the tunnel interface status and counters, then verify IPv6 connectivity across the tunnel using ping, examine routing protocol adjacency over the tunnel, validate end-to-end IPv6 reachability to remote networks, and finally confirm traffic flow with traceroute or debug commands.

Question 6

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

R1# show monitor session 5 detail
Session 5
---------
Type                   : ERSPAN Destination Session
Source IP              : 10.1.1.2
ERSPAN ID              : 100
Destination Ports      : Gi0/3
    Encapsulation      : Native
    Ingress            : Disabled

What does this output indicate?

Accepted Answer

The session is correctly configured as an ERSPAN destination session.. The output shows an ERSPAN destination session with source IP 10.1.1.2, ERSPAN ID 100, and destination port Gi0/3. This is the destination side of an ERSPAN configuration.

Answer

The session is misconfigured because the source must be a VLAN, not an IP.

Answer

The session is misconfigured because the destination port must have ingress enabled.

Answer

The session is misconfigured because the ERSPAN ID must be different from the source session.

Question 7

A network engineer is troubleshooting a PBR (Policy-Based Routing) issue on router R5. The engineer configured a route-map to set the next-hop for traffic from a specific source subnet. The route-map is applied to the incoming interface, but traffic from the source subnet is still being forwarded using the regular routing table. The engineer verifies that the ACL matches the traffic correctly. What is the most likely cause?

Accepted Answer

The route-map is missing a 'set ip next-hop' command, or the next-hop is not reachable.. PBR route-maps must have at least one 'match' and one 'set' statement. If the route-map has a 'match ip address' but no 'set ip next-hop' (or the next-hop is unreachable), PBR will not apply and traffic will use the routing table. Also, the route-map must be applied to the correct interface and direction.

Answer

The route-map is applied outbound instead of inbound on the interface.

Answer

The ACL is using a standard ACL, which cannot match source subnet correctly.

Answer

The route-map has a 'set default interface' command that overrides the next-hop.

Question 8

An engineer configures Control Plane Policing (CoPP) on a router to protect the control plane. After applying the policy, OSPF adjacencies go down. The policy includes a class that matches OSPF traffic with a police rate of 1000 pps. Which is the most likely explanation?

Accepted Answer

The OSPF traffic is matched by class-default, which has a low police rate or is set to drop, causing hello packets to be dropped.. When CoPP is applied, any traffic not explicitly matched by a user-defined class falls into class-default. If class-default has a low police rate or is configured to drop packets, OSPF hello packets (which are critical for adjacency maintenance) will be dropped, causing OSPF adjacencies to go down. The OSPF traffic is likely not being matched by the intended class due to incorrect classification or ordering, leaving it to be processed by class-default.

Answer

The police rate of 1000 pps is too low for OSPF hello packets.

Answer

CoPP only applies to management traffic, not routing protocols.

Answer

The OSPF process is not configured to use the control plane policy.

Question 9

Which TWO configuration steps are required to enable IPv6 RA Guard on a Cisco switch interface? (Choose TWO.)

Accepted Answer

Create an RA Guard policy using the 'ipv6 nd raguard policy POLICY_NAME' command.. An RA Guard policy must first be created using the 'ipv6 nd raguard policy POLICY_NAME' command to define the device role (e.g., 'device-role host' or 'device-role router') and other filtering parameters. Option B is correct because the policy must then be explicitly attached to the interface with 'ipv6 nd raguard attach-policy POLICY_NAME' to enforce RA filtering. Without both steps, RA Guard cannot be activated on the interface.

Answer

Enable IPv6 routing globally with 'ipv6 unicast-routing'.

Answer

Configure 'ipv6 nd raguard' directly on the interface without a policy.

Answer

Enable DHCPv6 Guard on the same interface to complement RA Guard.

Question 10

A network engineer runs the following command on Router R1:

R1# show ip dhcp relay information trusted
Interface                Trusted
GigabitEthernet0/1       Yes
GigabitEthernet0/2       No

Based on this output, which statement is correct?

Accepted Answer

DHCP relay information is trusted on GigabitEthernet0/1, so option 82 packets are accepted on that interface.. The command 'show ip dhcp relay information trusted' displays the trust status of each interface for DHCP relay information (option 82). When an interface is marked as 'Yes' under the Trusted column, it means the router will accept and forward DHCP packets that already contain option 82 information from that interface. Therefore, on GigabitEthernet0/1, option 82 packets are accepted.

Answer

DHCP relay information is trusted on both interfaces.

Answer

DHCP relay information is not configured on any interface.

Answer

DHCP relay information is trusted on GigabitEthernet0/2, so option 82 packets are dropped.

Question 11

A network engineer runs the following command to troubleshoot SNMP trap generation:

R1# show snmp mib
sysDescr.0 = Cisco IOS Software, C1900 Software (C1900-UNIVERSALK9-M), Version 15.7(3)M
sysObjectID.0 = .1.3.6.1.4.1.9.1.1
sysUpTime.0 = 123456789
sysContact.0 = admin@example.com
sysName.0 = R1
sysLocation.0 = Lab

What does this output indicate?

Accepted Answer

The router's system MIB is populated with correct values, including contact and location.. The output of 'show snmp mib' displays the system MIB (RFC 1213) values currently populated on the router. The presence of sysContact, sysName, and sysLocation with valid data indicates that the SNMP agent is running and these mandatory MIB-II objects are correctly configured. This confirms the router's system MIB is properly populated, which is a prerequisite for SNMP trap generation to function correctly.

Answer

The router's sysContact is not configured, causing SNMP traps to fail.

Answer

The router is not responding to SNMP queries.

Answer

The router uses SNMPv3 only.

Question 12

A network engineer is troubleshooting a route redistribution issue between OSPF and BGP. Router R1 runs both OSPF and BGP, and redistributes OSPF routes into BGP. The engineer notices that OSPF external routes are not appearing in the BGP table on R1. The show ip bgp command does not list these prefixes. The redistribute ospf 1 match external command is configured under BGP. What is the most likely cause?

Accepted Answer

The redistribute ospf 1 match external command under BGP is missing the subnets keyword.. When redistributing OSPF into BGP, the subnets keyword is required to redistribute classless subnets. Without it, only classful networks are redistributed, which may cause many routes to be missing.

Answer

OSPF has a higher administrative distance than BGP.

Answer

The OSPF process on R1 has a distribute-list blocking these routes.

Answer

BGP requires the network command to advertise routes, not redistribution.

Question 13

What is the default OSPF dead interval on a broadcast multi-access network (e.g., Ethernet) when the hello interval is 10 seconds?

Accepted Answer

40 seconds. On broadcast multi-access networks like Ethernet, OSPF defaults to a hello interval of 10 seconds. The dead interval is calculated as 4 times the hello interval, resulting in a default dead interval of 40 seconds. This ensures that a router has multiple missed hello opportunities before being declared dead, providing stability against transient network issues.

Answer

30 seconds

Answer

20 seconds

Answer

10 seconds

Question 14

An engineer configures EIGRP named mode with `address-family ipv4 unicast autonomous-system 100` and applies an offset-list to a neighbor using `offset-list 1 out 1000` under the `af-interface` configuration. Unexpectedly, the offset-list does not affect the feasible distance (FD) as expected, but the advertised distance (AD) is increased. Which is the most likely explanation?

Accepted Answer

The offset-list was applied under `af-interface` instead of `address-family`, so it modifies the AD sent to neighbors, not the FD.. In EIGRP named mode, offset-lists applied under the `af-interface` affect only the AD (the metric sent to neighbors), not the FD. To affect the FD, the offset-list must be applied under the `address-family` section using `offset-list {in|out} `. This is a subtle difference from classic mode where offset-lists always affect the FD for incoming updates.

Answer

The offset-list command is not supported in named mode; it must be replaced with a route-map to adjust metrics.

Answer

The offset-list was applied outbound, which only affects the AD; inbound offset-lists affect the FD.

Answer

The offset-list value of 1000 is too high and causes the route to be suppressed, so FD is not updated.

Question 15

Given this configuration on Router R5:

route-map OSPF-to-EIGRP permit 10
 match ip address prefix-list EIGRP-ONLY
 set metric 10000 100 255 1 1500
!
router eigrp 100
 redistribute ospf 1 route-map OSPF-to-EIGRP

What is the purpose of the route-map in this configuration?

Accepted Answer

The route-map filters OSPF routes based on the prefix-list and sets the metric for matching routes.. The route-map is used to filter which OSPF routes are redistributed into EIGRP (via the prefix-list) and to set the metric for those routes. Only routes matching the prefix-list will be redistributed.

Answer

The route-map sets the metric for all redistributed OSPF routes, but does not filter any routes.

Answer

The route-map is applied to inbound EIGRP updates, not to redistribution.

Answer

The route-map will deny all routes because there is no 'permit' statement for the prefix-list.