[2026] 300-510 Exam Dumps, Test Engine Practice Test Questions
Pass 300-510 exam [Mar 27, 2026] Updated 291 Questions
NEW QUESTION # 13
Refer to the exhibit. An administrator is troubleshooting network issues on a customer's network PE1 cannot form an LDP relationship with PE2 using LDP ID 192 168.1.1. Due to this connectivity issue, the customer's routes behind both PE routers cannot be exchanged.
Which action must the administrator take to correct the problem?
- A. Create a targeted LDP session on PE2 to override the missing routing table entry on PE1.
- B. Enable LDP session protection on the link that P1 uses as the next hop to PE2.
- C. Configure PE1 with a static route to 192.168.1.1.
- D. Configure PE2 to automatically select its own LDP router ID with 192.168.1.1.
Answer: C
NEW QUESTION # 14
Referring to the topology diagram show in the exhibit, which three statements are correct regarding the BGP routing updates? (Choose three.)
- A. The IBGP routing updates received by R1 from R4 will be propagated to the R5, R7, and R2 routers
- B. The EBGP routing updates received by R1 from R5 will be propagated to the R2 and R4 routers
- C. The IBGP routing updates received by R2 from R1 will be propagated to the R3 router
- D. The EBGP routing updates received by R1 from R5 will be propagated to the R2, R4, and R7 routers
- E. The EBGP routing updates received by R3 from R6 will be propagated to the R2 and R4 routers
- F. The IBGP routing updates received by R3 from R2 will be propagated to the R6 router
Answer: D,E,F
NEW QUESTION # 15
In a PIM-SM environment, which mechanism determines the traffic that a receiver receives?
- A. The receiver explicitly requests traffic from each desired source, which responds by sending all traffic.
- B. The receiver explicitly requests traffic from a single source, which responds by forwarding all traffic.
- C. The receiver explicitly requests its desired traffic from the RP on the shared tree.
- D. The RP on the shared tree floods traffic out of all PIM configured interfaces.
Answer: C
Explanation:
A shared tree is built first between receiver and the RP. The receiver is then able to switch to a Source tree as needed.
NEW QUESTION # 16
Refer to the exhibit.
After you applied these configurations to routers R1 and R2, the two devices could not form a neighbor relationship. Which reason for the problem is the most likely?
- A. The two routers cannot authenticate with one another.
- B. The two routers have the same network ID.
- C. The two routers have different IS-types.
- D. The two routers have the same area ID.
Answer: B
Explanation:
For those asking about the password, area authentication doesn't prevent neighboring to come up because it is carried only in LSP, CSNP and PSNP messages and not in IIH messages. https://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/13792-isis-authent.html
NEW QUESTION # 17
Refer to the exhibit. Router 1, Router 2, and Router 3 are co-located in an onsite data center of an office, but Router 4, Router 5, and Router 6 are installed in another data center several miles away. A network engineer is troubleshooting an RSVP- issue on the network. On most of the devices, the engineer can move all LSPs away from a selected interface and take it down for maintenance without interrupting traffic. However, when an interface on Router 3 is taken down, traffic on the network is disrupted. What must the engineer enable to resolve the issue on Router
3?
- A. soft-disperse feature
- B. FRR
- C. soft-preemption feature
- D. NSR
Answer: B
Explanation:
RSVP-TE (Resource Reservation Protocol - Traffic Engineering) is used to establish MPLS Traffic Engineering tunnels. When an interface on Router 3 is taken down, there is traffic disruption because no backup path is immediately available. Other routers are able to redirect traffic without issues, which indicates that Fast Reroute (FRR) is missing on Router 3.
FRR provides a local repair mechanism for MPLS TE tunnels. It allows a router to pre-calculate and pre-establish backup paths (also called detour paths) for primary LSPs. When the primary link or interface fails, traffic is rerouted immediately onto the backup path without significant delay.
By enabling FRR on Router 3, the LSPs will have pre-established backup paths, ensuring that traffic is redirected without disruption during interface maintenance or failure.
NEW QUESTION # 18
Refer to the exhibit. BGP is running on the network, and CE1 currently prefers routes to the internet via PE1. A network engineer must manipulate the BGP routes that CE1 receives from PE2 to be more desirable. The engineer configured a route map using MED and applied it on CE1 outbound from PE2. However, after a BGP soft reset, PE1 is still preferred. Which action must the engineer take so that PE2 is chosen as the next hop?
- A. Configure the route map with AS path prepend to manipulate the AS path to exit the autonomous system.
- B. Apply the route map on CE1 in the inbound direction.
- C. Configure the route map with MED and local preference to manipulate the route outbound.
- D. Update the route map to use only weight to manipulate the path.
Answer: C
NEW QUESTION # 19
What are three requirements for a static IPv6-in-IPv4 tunnel? (Choose three.)
- A. A dynamic IPv4 address must be configured.
- B. A static IPv4 address must be configured.
- C. Each tunnel endpoint must support IPv4 and IPv6.
- D. A static IPv6 address must be configured.
- E. A dynamic IPv6 address must be configured.
- F. Cisco Express Forwarding must be enabled.
Answer: B,C,D
Explanation:
NEW QUESTION # 20
Which statement about enabling segment routing for IGPs is true?
- A. Segment routing must first be enabled globally and then under the routing process
- B. Segment routing can be enabled only globally
- C. Segment routing must first be enabled under then routing process and then globally
- D. Segment routing can be enabled only under the routing process
Answer: A
Explanation:
Reference:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/seg_routing/configuration/xe-16-6/segrt-xe-16-6- book/sr-ospfv2-node-sid.html
NEW QUESTION # 21
Refer to the exhibit. R1 is expected to receive routes originating from AS 65516 and from any ASs that are directly attached to it. However, R1 is receiving routes only from AS 65516. Which action corrects the configuration?
- A. Add the regular expression ^$. in the AS-path filter to permit the traffic from R2.
- B. Change the regular expression in the AS-path permit filter to ^65516_[0-9]*$.
- C. Change the regular expression in the AS-path permit filter to .*.
- D. Change the regular expression in the AS-path permit filter to _65516_.
Answer: B
NEW QUESTION # 22
Refer to the exhibit.
After troubleshooting BGP traffic steering issue, which action did the network operator take to achieve the correct effect of this configuration?
- A. Routes that have passed through AS 65517 have the local preference set to 150 and the traffic is denied.
- B. Routes directly attached to AS 65517 have the local preference set to 150.
- C. Routes that have passed through AS 65517 have the local preference set to 150.
- D. Routes that have originated through AS 65517 have the local preference set to 150.
Answer: C
NEW QUESTION # 23
Refer to the exhibit.
Router 1 is connected to router 2 on interface TenGigE0/1. Which interface provides the alternate path to 172.16.200.9/32 when the link between router 1 and router 2 goes down?
- A. A backup path must be statically installed
- B. A primary path must be manually installed
- C. TenGigE0/2 interface provides the alternate path
- D. TenGigE0/1 interface provides the alternate path
Answer: C
NEW QUESTION # 24
What is used by SR-TE to steer traffic through the network?
- A. explicit maps
- B. dynamic rules
- C. shortest path calculated by IGP
- D. path policy
Answer: D
Explanation:
Explanation/Reference: https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/segment-routing/configuration/ guide/b-seg-routing-cg-asr9k/b-seg-routing-cg-asr9k_chapter_0100.html
NEW QUESTION # 25
After an engineer configures BGP in R1, it starts receiving this message
*Jun 29 13:30:50.122: %BGP-5-ADJCHANGE: neighbor 192.168.10.1 Down User reset Jun 29 13:30:52.341: %BGP-3-NOTIFICATION: sent to neighbor 192.168.10.1 2/6 (unacceptable hold time)
0 bytes
Which action makes the peering come back up again?
- A. Set up a hello timer higher.
- B. Set up a hold-down timer higher.
- C. Make a soft reset to the peer.
- D. Set up a minimum hold-down timer higher.
Answer: B
NEW QUESTION # 26
Refer to the exhibit.
After troubleshooting BGP traffic steering issue, which action did the network operator take to achieve the correct effect of this configuration?
- A. Routes that have passed through AS 65517 have the local preference set to 150 and the traffic is denied.
- B. Routes directly attached to AS 65517 have the local preference set to 150.
- C. Routes that have passed through AS 65517 have the local preference set to 150.
- D. Routes that have originated through AS 65517 have the local preference set to 150.
Answer: C
NEW QUESTION # 27
Refer to the exhibit. Routers R1, R2, R3, and R4 are peer routers that reside in different administrative domains. PIM-SM is running in each autonomous system, and EBGP is configured between the peers. A network administrator has just implemented MSDP between the connected peers. When the administrator enabled the MSDP configuration, R1 and R2 failed to establish a peering relationship. All other connected routers successfully established peering sessions.
Which action must the engineer take to resolve the issue between R1 and R2?
- A. Implement BGP authentication between the peers.
- B. Set the same MSDP password on both peers.
- C. Change the MSDP authentication method to clear text.
- D. Configure the peers to be in the same autonomous system.
Answer: B
NEW QUESTION # 28
Refer to the exhibit. An engineer is troubleshooting IS-IS configuration between two areas. IS-IS Area-A network 30.1.1.0/24 is leaked into IS-IS Area-B. R2 is failing to filter the route updates from network 10.1.1.0/24. Which configuration must the engineer apply to resolve the issue?
- A. R1(config)# ip prefix-list List2 seq 5 deny 10.1.1.0/24
R1(config)# interface fastethernet 0/0
R1(config-if)# ip router isis 100
R1(config-if)# router isis 100
R1(config-router)# distribute-list gateway List2 in
R (config-if)# router isis 150
R1(config-router)# distribute-list route-map Map1 in - B. R2(config)# ip prefix-list List2 seq 5 deny 10.1.1.0/24
R2(config)# interface fastethernet 0/0
R2(config-if)# ip router isis 100
R2(config-if)# router isis 100
R2(config-router)# distribute-list gateway List2 in - C. R2(config)# access-list 101 deny ip any 10.1.1.0 0.0.0.127
R2(config)# access-list 101 permit ip any 30.1.1.0 0.0.0.63
R2(config)# access-list 101 deny ip any 0.0.0.0 0.0.0.0
R2(config)# interface fastethernet 0/0
R2(config-if)# ip router isis 121
R2(config-if)# router isis 121
R2(config-router)# distribute-list 101 in - D. R2(config)# ip prefix-list List1 seq 3 deny 10.1.1.0/24
R2(config)# ip prefix-list List1 seq 5 permit 30.1.1.0/24 ge 25 1e
R2(config)# ip prefix-list List1 seq 10 permit 0.0.0.0/le 32
R2(config)# interface fastethernet 0/0
R2(config-if)# ip router isis 122
R2(config-if)# router isis 122
R2(config-router)# distribute-list prefix List1 in
Answer: B
Explanation:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_isis/configuration/15-mt/irs-15-mt- book/isis-inbound-filtering.html Example: Configuring Route Filtering by Next Hop (or Route Source) The following example shows how to enable IS-IS inbound filtering using next hop or a route source:
Device(config)# ip prefix-list List2 seq 5 deny 198.51.100.31/24
Device(config)# interface fastethernet 0/0
Device(config-if)# ip router isis 125
Device(config-if)# router isis 125
Device(config-router)# distribute-list gateway List2 in
NEW QUESTION # 29
Refer to the exhibits. A network operator is troubleshooting packet loss seen from the R1 loopback interface to the R2 loopback interface over the core network. The operator is attempting to identify the next leg in the path from PE1.
Which interface and label path should the operator investigate next?
- A. PE1 - Gi0/0/0/2 - forwarding label 24002
- B. PE1 - Gi0/0/0/3 - forwarding label 24001
- C. PE1 - Gi0/0/0/3 - forwarding label 24002
- D. PE1 - Gi0/0/0/2 - forwarding label 24001
Answer: B
NEW QUESTION # 30
Refer to the exhibit. The service provider deployed segment routing in its core P2 is connected to P3 and P4 via a point-to-multipoint link as shown. The service provider provides connectivity for a large enterprise with three main offices in different geographic regions Each office is connected via one of the three Pes. The enterprise wants to implement multicast traffic across the service provider to stream mission-critical applications between sites. The applications will be sourced from a server connected to the network through PE2.
Which action must the network-engineering team take so that multicast traffic will flow between the enterprise sites over the point-to-multipoint link?
- A. Implement PIM-DM to flood multicast traffic from the enterprise into the service provider core
- B. Implement RSVP to reserve bandwidth on the link between PE2 and P2
- C. Implement MLDP to allow multicast traffic to flow within the single AS
- D. Implement SR Tree-SID to build a multicast replication tree over the point-to-multipoint link
Answer: D
NEW QUESTION # 31
Refer to the exhibit.
P1 and PE3 Cisco IOS XR routers are directly connected and have this configuration applied. The BGP session is not coming up. Assume that there is no IP reachability problem and both routers can open tcp port 179 to each other. Which two actions fix the issue? (Choose two.)
- A. Change MD5 to HMAC-SHA1-12
- B. Remove the send and accept lifetime under key 1
- C. Change MD5 to HMAC-MD5
- D. Change MD5 to SHA-1
- E. Change MD5 to HMAC-ESP
Answer: A,C
NEW QUESTION # 32
Refer to the exhibit. A network engineer applied configuration on R1 to summarize all ISIS routes, but R2 Is still receiving specific routes from R1. The engineer has confirmed that both routers are configured with the correct summarization configuration, but R1 is not sending the correct summary routes. Which configuration must be applied to router R1 to summarize routes within Level 1?
- A. R1(config-router)#summary-address 1.0.0.0 255.0.0.0 level-1
- B. R1(config-router)#summary-address 1.0.0.0 255.0.0.0 level-
- C. R1(config-router)#no summary-address 1.0.0.0 255.0.0.0 level-1
- D. R1(config-router)#summary-address 1.0.0.0 255.0.0.0 level-1-2
Answer: A
NEW QUESTION # 33
RPL has several fundamental capabilities that differ from those present in configurations oriented to traditional route maps Routing policy language introduces the notion of sets Which group of set types is valid in RPL?
- A. acl-path-set community-set pre-community-set prefix-set and bgp-set
- B. as-path-set community-set. extcommunity-set prefix-set and rd-set
- C. route-path-set, community-set in-community-set prefix-set and rd-set
- D. access-control-set, community-set post-community-set pre-prefix-set and routed-set
Answer: B
NEW QUESTION # 34
Refer to the exhibit.
Which two commands must the engineer configure for the company's PIM-PIM network to enable Auto-RP mappings to be sent over the FastEthernet0/0 interface without affecting normal operation? (Choose two)
- A. enable dense mode
- B. enable auto-rp listener
- C. enable sparse-dense mode
- D. enable sparse-mode
- E. enable Auto-RP announcements
Answer: B,C
NEW QUESTION # 35
Refer to the exhibit.
P1 and PE3 Cisco IOS XR routers are directly connected and have this configuration applied. The BGP session is not coming up. Assume that there is no IP reachability problem and both routers can open tcp port 179 to each other. Which action fixes the issue?
- A. Change HMAC-MD5 to HMAC-SHA1-20
- B. Change HMAC-MD5 to HMAC-SHA1-12
- C. Change HMAC-MD5 to MD5
- D. Configure the send and accept lifetime under key 1
Answer: D
NEW QUESTION # 36
Refer to the exhibit.
Refer to the exhibit Networks 172.16.31.0/24 and 172 16 30.0/24 are advertised in area 34. and network 172.22 10.0/24 is advertised in area 0. A recent security review discovered that users connected to routers R1 and R2 have been making unauthorized access to an application running on network 172 16 31 0/24 An engineer determined that routers R1 and R2 are receiving updates for network 17 16 31 0/24 Which action resolves the issue?
- A. Apply route filtering on routers RI and R2
- B. Apply route filtering on routers R3 and R4.
- C. Apply route filtering on router R3 only.
- D. Apply route filtering on router R4 only.
Answer: D
NEW QUESTION # 37
Which feature is used in multicast routing to prevent loops?
- A. STP
- B. inverse ARP
- C. RPF
- D. split horizon
Answer: C
NEW QUESTION # 38
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