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Hard Difficulty Questions

Practise Cisco CCNP ENARSI 300-410 practice questions — original exam-style scenarios covering every exam domain, with detailed explanations, wrong-answer analysis, and common exam traps.

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300-410
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Scenario guide

How to approach hard difficulty questions

These are the questions most candidates get wrong. They require connecting multiple concepts, reading tricky output, or knowing edge-case behaviour that isn't on most study cards. Practising them trains you to operate under uncertainty — a necessary skill on the real exam.

Quick answer

Hard Difficulty Questions questions test whether you can apply the concept in context, not just recognise a definition.

How the topic appears in realistic exam-style scenarios.

Which detail in the question changes the correct answer.

How to eliminate plausible but wrong options.

How to connect the question back to the wider exam objective.

Related practice questions

Related 300-410 topic practice pages

Scenario questions usually connect to one or more exam topics. Use these links to review the underlying concepts behind the scenario.

Layer 3 Technologies practice questions

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EIGRP Troubleshooting practice questions

Practise 300-410 questions linked to EIGRP Troubleshooting.

OSPF Troubleshooting (v2/v3) practice questions

Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).

BGP Troubleshooting practice questions

Practise 300-410 questions linked to BGP Troubleshooting.

Route Redistribution practice questions

Practise 300-410 questions linked to Route Redistribution.

Policy-Based Routing (PBR) practice questions

Practise 300-410 questions linked to Policy-Based Routing (PBR).

VRF-Lite practice questions

Practise 300-410 questions linked to VRF-Lite.

Route Maps and Route Filtering practice questions

Practise 300-410 questions linked to Route Maps and Route Filtering.

Administrative Distance practice questions

Practise 300-410 questions linked to Administrative Distance.

Route Summarization practice questions

Practise 300-410 questions linked to Route Summarization.

Bidirectional Forwarding Detection (BFD) practice questions

Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).

VPN Technologies practice questions

Practise 300-410 questions linked to VPN Technologies.

Practice set

Practice scenarios

Question 1harddrag order
Read the full VPN explanation →

Drag and drop the steps to troubleshoot an IPsec site-to-site VPN adjacency failure into the correct order, from first to last.

Question 2harddrag order
Study the full IPv6 explanation →

Drag and drop the steps to troubleshoot IPv6 over IPv4 tunnel adjacency or connectivity failures into the correct order, from first to last.

Question 3harddrag order
Study the full ACL explanation →

Drag and drop the steps to troubleshoot IPv4 ACL adjacency or connectivity failures into the correct order, from first to last.

Question 4hardmulti select
Study the full IPv6 explanation →

Which THREE symptoms indicate that IPv6 unicast RPF is misconfigured or failing on an interface? (Choose THREE.)

Question 5hardmulti select
Study the full IPv6 explanation →

Which THREE statements about IPv6 unicast RPF (uRPF) are true? (Choose THREE.)

Question 6hardmultiple choice
Review the full OSPF breakdown →

A large enterprise network uses OSPFv3 for IPv6 routing. Router R1 and R2 are connected via a multi-access Ethernet link. R1 is configured with 'ipv6 ospf network point-to-point' while R2 uses the default broadcast network type. R1 has an IPv6 ACL applied inbound on its interface that permits only OSPF (89) and denies all other traffic. R2 is unable to form a full OSPF adjacency with R1. R2 shows 'OSPFv3 adjacency state is EXSTART/EXCHANGE' and logs 'Bad LSReq'. What is the root cause?

Question 7hardmultiple choice
Study the full EIGRP explanation →

An enterprise uses EIGRP for IPv6 with route summarization. Router R1 has a summary route 2001:db8:1::/48 via Null0 redistributed into EIGRP. Router R2 receives this summary and has a more specific route 2001:db8:1:1::/64 learned via a different interface. R2's IPv6 uRPF is configured in strict mode on the interface facing R1. Traffic from a host behind R2 destined to 2001:db8:1:2::1 is being dropped. R2 shows 'ipv6 cef' indicates the summary route points to R1, but uRPF checks fail. What is the root cause?

Question 8hardmultiple choice
Study the full EIGRP explanation →

A DMVPN network uses IPv6 with EIGRP as the routing protocol. Spoke routers R2 and R3 are behind NAT and use mGRE tunnels. The hub R1 has an IPv6 ACL applied inbound on the tunnel interface that permits only EIGRP and denies all other IPv6 traffic. Spoke-to-spoke traffic fails even though direct tunnels are established. R2 shows 'ping 2001:db8:3::1 source loopback0' fails, but 'ping 2001:db8:1::1' (hub) succeeds. What is the root cause?

Question 9hardmultiple choice
Read the full MPLS explanation →

An MPLS network uses LDP for label distribution with IPv6. Router R1 and R2 are LDP peers. R1 has an IPv6 ACL applied inbound on the interface facing R2 that permits only TCP port 646 (LDP) and denies all other traffic. R2 shows 'show mpls ldp neighbor' indicates the neighbor is up, but 'show mpls forwarding-table' shows no labels for IPv6 prefixes. R1's 'show mpls ldp bindings' shows labels for all prefixes. What is the root cause?

Question 10hardmultiple choice
Open the full BGP breakdown →

A dual-stack network uses BGP for IPv6 between AS 100 and AS 200. Router R1 (AS 100) has an inbound route-map that sets local preference to 200 for routes from R2 (AS 200). R1 also has an IPv6 ACL applied inbound that permits only BGP (TCP 179) and denies ICMPv6. R2 advertises a prefix 2001:db8:1::/48. R1's BGP table shows the prefix with local preference 200, but 'show ipv6 route' does not install it. R1 has uRPF strict mode on the interface facing R2. What is the root cause?

Question 11hardmultiple choice
Review the full OSPF breakdown →

An enterprise uses VRF-lite with IPv6. VRF A on R1 leaks routes to VRF B using route-target import/export. R1 has an IPv6 ACL applied inbound on the interface in VRF A that permits only OSPFv3 and denies all other traffic. R1's VRF B has a static default route pointing to a next-hop in VRF A. Traffic from VRF B to the internet fails. R1 shows 'ping vrf B 2001:db8:2::1' fails, but 'ping vrf A 2001:db8:2::1' succeeds. What is the root cause?

Question 12hardmultiple choice
Review the full OSPF breakdown →

An OSPFv3 network has multiple areas. Area 0 includes R1 and R2. Area 1 includes R2 and R3. R2 is an ABR. R1 has an IPv6 ACL applied inbound on the interface to R2 that permits only OSPFv3 and denies all other traffic. R3 advertises a prefix 2001:db8:3::/48 into Area 1. R1's routing table shows the prefix but with a next-hop of R2. R1's uRPF is configured in strict mode on the interface to R2. Traffic from R1 to 2001:db8:3::1 is dropped. R1 shows 'show ipv6 cef 2001:db8:3::/48' points to R2's link-local address. What is the root cause?

Question 13hardmultiple choice
Read the full DHCP explanation →

A network engineer is troubleshooting a DHCPv6 prefix delegation issue on router R1 and runs the following command:

R1# debug ipv6 dhcp detail

Output: IPv6 DHCP: Received SOLICIT message from FE80::21A:2BFF:FE3C:4D01 on GigabitEthernet0/0 IPv6 DHCP: Using interface pool DHCP_POOL IPv6 DHCP: Sending ADVERTISE message to FE80::21A:2BFF:FE3C:4D01 IPv6 DHCP: Received REQUEST message from FE80::21A:2BFF:FE3C:4D01 IPv6 DHCP: Client requests prefix 2001:DB8:1::/48 IPv6 DHCP: Prefix 2001:DB8:1::/48 not available in pool DHCP_POOL IPv6 DHCP: Sending REPLY message with Status Code NoPrefixAvail

What does this output indicate?

Question 14hardmultiple choice
Read the full DHCP explanation →

What is the default DHCPv4 client lease time on a Cisco IOS-XE router configured as a DHCP client?

Question 15hardmultiple choice
Study the full EIGRP explanation →

An enterprise uses EIGRP for IPv6 with route redistribution from a static route. R1 has a static route 2001:db8:0::/32 via Null0 redistributed into EIGRP. R2 receives this route and has a more specific route 2001:db8:1::/32 via a different interface. R2 has an IPv6 ACL applied inbound on the interface facing R1 that permits only EIGRP and denies all other traffic. R2's uRPF is configured in loose mode. Traffic from R2 to 2001:db8:2::1 fails. R2 shows 'show ipv6 route' has both routes, but 'show ipv6 cef' shows the summary route for 2001:db8:2::1 pointing to R1. What is the root cause?

Question 16hardmultiple choice
Open the full BGP breakdown →

A dual-stack network uses BGP for IPv6 between two ISPs. R1 (AS 100) receives a full BGP table from R2 (AS 200). R1 has an IPv6 ACL applied inbound on the interface to R2 that permits only BGP (TCP 179) and denies all other traffic. R1 also has uRPF configured in strict mode on the same interface. R1's BGP table has a route to 2001:db8:1::/48 with next-hop 2001:db8:2::2. R1's routing table shows the route, but traffic from R1 to 2001:db8:1::1 fails. R1 shows 'show ipv6 cef 2001:db8:1::/48' points to 2001:db8:2::2 via the interface to R2. What is the root cause?

Question 17hardmultiple choice
Study the full IPv6 explanation →

A network engineer runs the following command to debug IPv6 traffic filtering:

R1# debug ipv6 packet access-list FILTER detail

IPv6 packet debugging is on for access list FILTER (detail)

*Mar 1 00:01:23.456: IPv6: source 2001:DB8:2::1 (GigabitEthernet0/0)
*Mar 1 00:01:23.456:   dest 2001:DB8:3::1 (GigabitEthernet0/1)
*Mar 1 00:01:23.456:   traffic class 0, flowlabel 0, hlim 64, next header 6 (TCP)
*Mar 1 00:01:23.456:   denied by access-list FILTER

What does this output indicate?

Question 18hardmultiple choice
Study the full IPv6 explanation →

A network engineer runs the following command to debug IPv6 uRPF:

R1# debug ipv6 verify

IPv6 verify debugging is on

*Mar 1 00:02:34.567: IPv6 verify: source 2001:DB8:4::1 on GigabitEthernet0/0
*Mar 1 00:02:34.567:   no route to source

What does this output indicate?

Question 19hardmultiple choice
Study the full IPv6 explanation →

Which IPv6 traffic filter can be used to match traffic based on the Flow Label field?

Question 20hardmultiple choice
Study the full IPv6 explanation →

A network engineer runs the following command to debug IPv6 uRPF with detailed information:

R1# debug ipv6 verify detail

IPv6 verify debugging is on (detail)

*Mar 1 00:03:45.678: IPv6 verify: source 2001:DB8:5::1 on GigabitEthernet0/0
*Mar 1 00:03:45.678:   route to source via GigabitEthernet0/1, not same as input interface

What does this output indicate?

These 300-410 practice questions are part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style 300-410 questions with detailed explanations, topic-based practice, mock exams, readiness tracking, and study analytics.