Practice Free 300-410 Exam Online Questions
What is LDP label binding?
- A . neighboring router with label
- B . source prefix with label
- C . destination prefix with label
- D . two routers with label distribution session
C
Explanation:
Text Description automatically generated with medium confidence
Refer to the exhibit.
The administrator is trying to overwrite an existing file on the TFTP server that was previously uploaded by another router. However, the attempt to update the file fails.
Which action resolves this issue?
- A . Make the packages.conf file executable by all on the TFTP server
- B . Make the packages.conf file writable by all on the TFTP server
- C . Make sure to run the TFTP service on the TFTP server
- D . Make the TFTP folder writable by all on the TFTP server
Which configuration adds an IPv4 interface to an OSPFv3 process in OSPFv3 address family
configuration?
- A . Router ospf3 1 address-family ipv4
- B . Router(config-router)#ospfv3 1 ipv4 area 0
- C . Router(config-if)#ospfv3 1 ipv4 area 0
- D . Router ospfv3 1 address-family ipv4 unicast
C
Explanation:
Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/xe-3s/iro-xe-3s-book/ip6-route-ospfv3-add-fam-xe.html
Refer to the exhibit.
An engineer must configure a per VRF for TACACS+ for company A.
Which configuration on RTG-1 accomplishes the task?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
Refer to the exhibit.
AS 111 mut not be used as a transit AS, but ISP-1 is getting ISP-2 routes from AS 111.
Which configuration stops Customer AS from being used as a transit path on ISP-1?
- A . ip as-path access-list 1 permit ^$
- B . ip as-path access-list 1 permit_111_
- C . ip as-path access-list 1 permit."
- D . ip as-path access-list 1 permit ^111$
Refer to the exhibit.
Troubleshoot and ensure that branch B only ever uses the MPLS B network to reach HQ.
Which action achieves this requirement?
- A . Introduce an AS path filter on branch A routers so that only local prefixes are advertised into BGP
- B . increase the local preference for all HQ prefixes received at branch B from the MPLS B network to
be higher than the local preferences used on the MPLS A network - C . Introduce AS path prepending on the branch A MPLS B network connection so that any HQ advertisements from branch A toward the MPLS B network are prepended three times
- D . Modify the weight of all HQ prefixes received at branch B from the MPLS B network to be higher than the weights used on the MPLS A network
A
Explanation:
If we modify the weight, increase local preference or use AS path prepending then we can only make MPLS B prefer over MPLS
Refer to the exhibit.
A network engineer notices that R1 and R2 cannot establish an eBGP peering.
The following messages appear in the log:
Which configuration must the engineer apply to R1 to restore the eBGP peering?
A)
B)
C)
D)
- A . Option A
- B . Option B
- C . Option C
- D . Option D
How are CE advertised routes segmented from other CE routers on an MPLS PE router?
- A . with a combination of VRF-Lite and MP-BGP
- B . by pushing MPLS labels advertised by LDP on customer routes
- C . by enabling multiple instances of BGP. one for each CE router
- D . by assigning CE-facing interfaces to different VRFs
D
Explanation:
In an MPLS PE router, CE advertised routes are segmented from other CE routers by assigning CE-facing interfaces to different Virtual Routing and Forwarding (VRF) instances12. A VRF is a technology that allows multiple instances of a routing table to co-exist within the same router at the same time. By associating a network interface with a VRF, the network layer (Layer 3) has a different view of the network topology. This allows the segmentation of routing paths for traffic from different customers or different types of traffic. In the context of MPLS, VRFs are used to create separate routing instances for each customer on a PE router3.
Reference: Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) training videos CCNP Enterprise Advanced Routing ENARSI 300-410 Official Cert Guide Implementing Cisco Enterprise Advanced Routing and Services source documents or study guide MPLS routes to advertise from CE to PE – Cisco Community Configuring Route Exchange Between PE and CE Devices – CloudEngine 12800 and 12800E V200R005C10 Configuration Guide – VPN C Huawei Customer edge router – Wikipedia
Refer to the exhibit.
The output of the trace route from R5 shows a loop in the network.
Which configuration prevents this loop?
A)
B)
C)
D)
- A . Option A
- B . Option B
- C . Option C
- D . Option D
A
Explanation:
The reason for the loop is that R2 is forwarding the packets destined to 10.1.1.1 to R4, instead of R1. This is because in the redistribute OSPF statement, BW metric has a higher value and delay has a value of 1. So, R2 chooses R4 over R1 for 10.1.1.0/24 subnet causing a loop. Now, R5 learns 10.1.1.0/24 from R3 and advertises the same route to R4, that R4 redistributes back in EIGRP. If R3 sets a tag of 1 while redistributing EIGRP in OSPF, and R4 denies all the OSPF routes with tag 1 while redistributing, it will not advertise 10.1.1.0/24 back into EIGRP. Hence, the loop will be broken.
Refer to the exhibit.
The network administrator has configured the Customer Edge router (AS 64511)
to send only summarized routes toward ISP-1 (AS 100) and ISP-2 (AS 200).
router bgp 64511
network 172.16.20.0 mask 255.255.255.0
network 172.16.21.0 mask 255.255.255.0
network 172.16.22.0 mask 255.255.255.0
network 172.16.23.0 mask 255.255.255.0
aggregate-address 172.16.20.0 255.255.252.0
After this configuration. ISP-1 and ISP-2 continue to receive the specific routes and the summary route.
Which configuration resolves the issue?
- A . router bgp 64511
aggregate-address 172.16.20.0 255.255.252.0 summary-only - B . router bgp 64511
neighbor 192.168.100.1 summary-only
neighbor 192.168.200.2 summary-only - C . interface E 0/0
ip bgp suppress-map BLOCK_SPECIFIC
!
interface E 0/1
ip bgp suppress-map BLOCK_SPECIFIC
!
ip prefix-list PL_BLOCK_SPECIFIC
permit 172.16.20.0/22 ge 24
!
route-map BLOCK_SPECIFIC permit 10
match ip address prefix-list PL_BLOCK_SPECIFIC - D . ip prefix-list PL_BLOCK_SPECIFIC
deny 172.16.20.0/22 ge 22
ip prefix-list PL BLOCK SPECIFIC
permit 172.16.20.0/22
!
route-map BLOCK_SPECIFIC permit 10
match ip address prefix-list PL_BLOCK_SPECIFIC
!
router bgp 64511
aggregate-address 172.16.20.0 255 255.252.0 suppress-map BLOCKSPECIFIC
A
Explanation:
When the aggregate-address command is used within BGP routing, the aggregated address is advertised, along with the more specific routes. The exception to this rule is through the use of the summary-only command. The “summary-only” keyword suppresses the more specific routes and announces only the summarized route.