300-410 ENARSI：Implementing Cisco Enterprise Advanced Routing and Services
Update：2026年4月18日
Questions and Answers: 615 Q&A
1.
While troubleshooting connectivity issues to a router, these details are noticed:
Standard pings to all router interfaces, including loopbacks, are successful.
Data traffic is unaffected.
SNMP connectivity is intermittent.
SSH is either slow or disconnects frequently.
Which command must be configured first to troubleshoot this issue?
2.
Which action resolves intermittent connectivity observed with the SNMP trap packets?
3.
R1 is configured with IP SLA to check the availability of the server behind R6 but it kept failing. Which configuration resolves the issue?
4.
The network administrator is tasked to configure R1 to authenticate telnet connections based on Cisco ISE using RADIUS. ISE has been configured with an IP address of 192.168.1.5 and with a network device pointing towards R1 (192.168.1.1) with a shared secret password of Cisco123. If ISE is down, the administrator should be able to connect using the local database with a username and password combination of admin/cisco123. The administrator has configured the following on R1:
aaa new-model
username admin password cisco123
radius server ISE1
address ipv4192.168.1.5
key Cisco123
!
aaa group server tacacs+RAD-SERVserver name ISE1
!
aaa authentication login RAD-LOCAL group RAD-SERV
ISE has gone down. The Network Administrator is not able to Telnet to R1 when ISE went down.
Which two configuration changes will fix the issue? (Choose two.)
5.
How many labels are present in an MPLS Layer 3 packet traversing through the network without traffic engineering?
6.
R1 and R2 use IGP protocol to route traffic between AS 100 and AS 200 despite being configured to use BGP. Which action resolves the issue and ensures the use of BGP?
7.
The remote branch locations have a static neighbor relationship configured to R1 only R1 has successful neighbor relationships with the remote locations of R2 and R3, but the end users cannot communicate with each other. Which configuration resolves the issue’
8.
An engineer examines the BGP update for the IPv6 prefix 2001:db8::1/128. which should have been summarized into a /64 prefix. Which sequence of actions achieves the summarization?
9.
What is considered the primary advantage of running BFD?
10.
An engineer configured user login based on authentication database on the router, but no one can log into the router. Which configuration resolves the issue?
11.
What is the purpose of an OSPF sham-link?
12.
NTP is configured across the network infrastructure and Cisco DNA Center. An NTP issue was reported on the Cisco DNA Center at 17:15. Which action resolves the issue?
13.
A network administrator notices these console messages from host 10.11.110.12 originating from interface E1/0. The administrator considers this an unauthorized attempt to access SNMP on R1. Which action prevents the attempts to reach R1 E1/0?
14.
Which statement about redistribution from BGP into OSPF process 10 is true?
15.
An engineer configures router A to mark all inside to outside traffic from network 192 168 1 0, except from host 192 168 1 1. with critical IP precedence. The policy did not work as expected Which configuration resolves the issue?
16.
The connected routers do not show up as OSPF neighbors. Which action resolves the issue?
17.
How are LDP neighbors discovered?
18.
What is the minimum time gap required by the local system before putting a BFD control packet on the wire?
19.
The network administrator configured CoPP so that all HTTP and HTTPS traffic from the administrator device located at 172.16 1.99 toward the router CPU is limited to 500 kbps. Any traffic that exceeds this limit must be dropped.
access-list 100 permit ip host 172.16.1.99 any
!
class-map CM-ADMIN
match access-group 100
!
policy-map PM-COPP
class CM-ADMIN
police 500000 conform-action transmit
!
interface E0/0
service-policy input PM-COPP
CoPP failed to capture the desired traffic and the CPU load is getting higher.
Which two configurations resolve the issue? (Choose two.)
20.
Users were moved from the local DHCP server to the remote corporate DHCP server. After the move, none of the users were able to use the network. Which two issues will prevent this setup from working properly? (Choose two)
21.
An engineer configured SNMP communities on the Core_SW1, but the SNMP server cannot obtain information from Core_SW1. Which configuration resolves this issue?
22.
R2 is a route reflector, and R1 and R3 are route reflector clients. The route reflector learns the route to 172.16.25.0/24 from R1, but it does not advertise to R3. What is the reason the route is not advertised?
23.
Which method changes the forwarding decision that a router makes without first changing the routing table or influencing the IP data plane?
24.
An engineer is troubleshooting a TACACS problem. Which action resolves the issue?
25.
The summary route is not shown in the RouterB routing table after this below configuration on Router_A,Which Router_A configuration resolves the issue by advertising the summary route to Router B?
interface ethernet 0
description location ID:S4289T9E09F39
ip address 192.168.3.1255.255.255.0
ip summary-address eigrp 1172.16.80.0255.255.240.0
26.
Branch 2 hosts cannot receive dynamic IP addresses. Which action resolves the issue?
27.
During the maintenance window an administrator accidentally deleted the Telnet-related configuration that permits a Telnet connection from the inside network (Eth0/0) to the outside of the networking between Friday – Sunday night hours only. Which configuration resolves the issue?
28.
The SNMP server with IP address 172.16 4 4 cannot access host router A Which configuration command on router A resolves the issue?
29.
The remote server is failing to receive the NetFlow data Which action resolves the issue?
30.
Which two statements about redistributing EIGRP into OSPF are true? (Choose two)
31.
A network engineer troubleshooting a packet drop problem for the host 172.16.100.5 notices that only one link is used and installed on the routing table, which saturates the bandwidth. Which action must the engineer take to resolve the high bandwidth utilization problem and share the traffic toward this host between the two available links?
32.
What is a function of an end device configured with DHCPv6 guard?
33.
A network administrator configured name resolution for IPv6 traffic to be allowed through an inbound access list. After the access list is applied to resolve the issue, name resolution still did not work. Which action does the network administrator take to resolve the name resolution problem?
34.
An engineer failed to run diagnostic commands on devices using Cisco DNA Center. Which action in Cisco DNA Center resolves the issue?
35.
An engineer sets up a DMVPN connection to connect branch 1 and branch 2 to HQ branch 1 and branch 2 cannot communicate with each other. Which change must be made to resolve this issue?
36.
R1 is being monitored using SNMP and monitoring devices are getting only partial information. What action should be taken to resolve this issue?
37.
Drag and drop the descriptions from the left onto the corresponding MPLS components on the right.
38.
Router R2 should be learning the route for 10.123.187.0/24 via EIGRP. Which action resolves the issue without introducing more issues?
39.
Which transport layer protocol is used to form LDP sessions?
40.
An engineer must advertise routes into IPv6 MP-BGP and failed. Which configuration resolves the issue on R1?
41.
The administrator configured the network devise for end-to-end reachability, but the ASBRs are not propagation routes to each other. Which set of configuration resolves this issue?
RR
router bgp 100
neighbor10.1.1.1 remote-as100
neighbor10.1.2.2remote-as100
neighbor10.1.3.3remote-as 100
ASBR2
router bgp 100
neighbor 10.1.1.4 remote-as 100
ASBR3
router bgp 100
neighbor 10.1.2.4 remote-as 100
ASBR4
router bgp 100
neighbor 10.1.3.4 remote-as 100
42.
R1 and R2 have been configured where the neighbor relationship must be authenticatedusmgMD5
R1
router bgp 100
neighbor 172.16.1.2 remote-as 200
neighbor 172.16.1.1 password cisco123
R2
router bgp 200
neighbor 172.16.1.1 remote-as 100
neighbor 172.16.1.1 password cisco
The neighbor relationship is not coming up. Which configuration resolves the issue?
43.
A network administrator performed a Compact Flash Memory upgrade on a Cisco Catalyst 6509 Switch. Everything is functioning normally except SNMP, which was configured to monitor the bandwidth of key interfaces but the interface indexes are changed. Which global configuration resolves the issue?
44.
The administrator successfully logs into R1 but cannot access privileged mode commands. What should be configured to resolve the issue?
45.
The server for the finance department is not reachable consistently on the 200.30.40.0/24 network and after every second month it gets a new IP address. Which two actions must be taken to resolve this Issue? (Choose two.)
ip dhcp pool 1
!
ip dhcp pool 2
!
network 200.30.30.0/24
network 200.30.40.0/24
default-router 200.30.30.100
default-router 200.30.40.100
lease 40lease 40
46.
Which feature is used by LDP in the forwarding path within the MPLS cloud?
47.
SanFrancisco and Boston routers are choosing slower links to reach each other despite the direct links being up Which configuration fixes the issue?
48.
An engineer must configure PBR on R1 to reach to 10.2.2.0/24 via R3 AS64513 as the primary path and a backup route through default route via R2 AS64513. All BGP routes are in the routing table of R1. but a static default route overrides BGP routes. Which PBR configuration achieves the objective?
49.
A network is configured with IP connectivity, and the routing protocol between devices started having problems right after the maintenance window to implement network changes. Troubleshoot and resolve to a fully functional network to ensure that:
50.
AS111 is receiving its own routes from AS200 causing a loop in the network. Which configuration provides loop prevention?
AS111
Router bgp 111
Neighbor 195.1.1.1 remote-as 100
Neighbor 195.1.1.1 allowas-in
Neighbor 195.1.2.2 remote-as 200
Neighbor 195.1.2.2 allowas-in
51.
The Math and Science departments connect through the corporate. IT router but users in the Math department must not be able to reach the Science department and vice versa Which configuration accomplishes this task?
52.
SW100 cannot receive routes from R1 Which configuration resolves the issue?
53.
R1 and R2 cannot establish an EIGRP adjacency. Which action establishes EIGRP adjacency?
54.
What is the output of the following command: show ip vrf
55.
A network engineer must configure a DMVPN network so that a spoke establishes a direct path to another spoke if the two must send traffic to each other. A spoke must send traffic directly to the hub if required Which configuration meets this requirement?
56.
R1 has a route map configured, which results in a loss of partial IPv6 prefixes for the BGP neighbor, resulting in service degradation. How can the full service be restored?
R1(config)#ipv6 prefix-ist PRE-PEND-PREFIX permit 2001:db8:D:a:/64
R1(config)#route-map PRE-PEND permit 10
R1(config-route-map)#match ipv6 address prefix-list PRE-PEND-PREFIX
R1(config-route-map)#set as-path prepend 65412
R1(config)#router bgp 65412
R1(config-router)#address-family ipv6
R1(config-router-al#neighbor 2001:db8:0-20::2 route-map PRE-PEND out
57.
After a new regional office is set up,not all guests can access the internet via guest Wi Fi. Clients are getting the correct IP address from guest Wi-Fi VLAN 364. which action resolves the issue ?
58.
An engineer configured a company’s multiple area OSPF head office router and Site A cisco routers with VRF lite. Each site router is connected to a PE router of an MPLS backbone.
After finishing both site router configurations, none of the LSA 3,4 5, and 7 are installed at Site A
router. Which configuration resolves this issue?
59.
The neighbor is not coming up. Which two sets of configurations bring the neighbors up? (Choose two.)
The R1 and R2 configurations are:
R1
router bgp 100neighbor 10.1.1.2 remote-as 200
R2
router bgp 200neighbor 10.1.1.1 remote-as 100
60.
A network administrator is trying to access a branch router using TACACS+ username and password credentials, but the administrator cannot log in to the router because the WAN connectivity is down. The branch router has following AAA configuration:
aaa new-model
aaa authorization commands 15 default group tacacs+
aaa accounting commands 1 default stop-only group tacacs+
aaa accounting commands 15 default stop-only group tacacs+
tacacs-server host 10.100.50.99
tacacs-server key CiSco123
Which command will resolve this problem when WAN connectivity is down?
61.
The network administrator configured redistribution on an ASBR to reach to all WAN networks but failed Which action resolves the issue?
62.
A network administrator must block ping from user 3 to the App Server only. An inbound standard access list is applied to R1 interface G0/0 to block ping. The network administrator was notified that user 3 cannot even ping user 9 anymore. Where must the access list be applied in the outgoing direction to resolve the issue?
63.
The Customer Edge router (AS 65500) wants to use ASC100 as the preferred ISP for all external routes
Customer Edge
route-map SETLP
set local-preference 111
router bgp 65500
neighbor 192.168.111.1 remote-as 100
neighbor 192.168.111.1 route-map SETLP out
neighbor 192.168.112.2 remote-as 200
This configuration failed to send routes to AS 100 as the preferred path. Which set of configuration
resolves the issue?
64.
Which protocol must be secured with MD-5 authentication across the MPLS cloud to prevent hackers from introducing bogus routers?
65.
Drag and drop the MPLS concepts from the left onto the descriptions on the right.
66.
To provide reachability to network 10.1.1.0 /24 from R5, the network administrator redistributes EIGRP into OSPF on R3 but notices that R4 is now taking a ........... path through R5 to reach 10.1.1.0/24 network. Which action fixes the issue while keeping the reachability from R5 to 10.1.1.0/24 network?
67.
An engineer is troubleshooting suboptimal communication from the 192.168.5.32/28 subnet to the 172.16.3.16/28 segment using the slowest links. Which configuration resolves the suboptimal routing issue?
68.
Routing protocols are mutually redistributed on R3 and R1. Users report intermittent connectivity to services hosted on the 10.1.1.0/24 prefix. Significant routing update changes are noticed on R3 when the show ip route profile command is run. How must the services be stabilized?
69.
After recovering from a power failure. Ethernet0/1 stayed down while Ethernet0/0 returned to the up/up state The default route through ISP1 was not reinstated m the routing table until Ethernet0/1 also came up Which action resolves the issue?
70.
Phase-3 tunnels cannot be established between spoke-to-spoke in DMVPN. Which two commands are missing? (Choose two.)
71.
A network administrator is troubleshooting IPv6 address assignment for a DHCP client that is not getting an IPv6 address from the server.Which configuration retrieves the client IPv6 address from the DHCP server?
72.
How does LDP operate in an MPLS network?
73.
Aswitchhas been configured to provide DHCP relay on VLAN 100 to a server with an IP address of 10.1.1.1. The DHCP server is sending syslog reports of multiple TFTP requests that also originate from the switch. As a result, the server CPU exceeded a configured threshold. Which action does the network administrator recommend to bring the server CPU threshold down?
74.
What are two characteristics of a VRF instance? (Choose two)
75.
R1 cannot receive the R2 Interfaces with individual prefixes. What must be reconfigured to advertise R2 Interfaces to R1?
76.
Drag and drop the MPLS VPN concepts from the left onto the correct descriptions on the right.
77.
A company Is redesigning WAN infrastructure so that all branch sites must communicate via the head office and the head office can directly communicate with each site independently. The network engineer must configure the head office router by considering zero-touch technology when adding new sites in the same WAN infrastructure. Which configuration must be applied to the head office router to meet this requirement?
78.
When configuring Control Plane Policing on a router to protect it from malicious traffic, an engineer observes that the configured routing protocols start flapping on that device. Which action in the Control Plane Policy prevents this problem in a production environment while achieving the security objective?
79.
Users in the branch network of 2001:db8:0:4::/64 report that they cannot access the Internet. Which command is issued in IPv6 router EIGRP 100 configuration mode to solve this issue?
80.
After redistribution is enabled between the routing protocols; PC2, PC3, and PC4 cannot reach PC1. Which action can the engineer take to solve the issue so that all the PCs are reachable?
81.
An engineer configured route exchange between two different companies for a migration project EIGRP routes were learned in router C but no OSPF routes were learned in router A. Which configuration allows router A to receive OSPF routes?
82.
Which routes from OSPF process 5 are redistributed into EIGRP?
router eigrp 1
redistribute ospf 5 match external route-map OSPF-TO-EIGRP
metric 10000200025511500
route-map OSPF-TO-EIGRP
match ip address TO-OSPF
83.
Which interface configuration must be configured on the HUB router to enable MVPN with mGRE mode?
84.
Which statement about R1 is true?
R1(config)#route-map ADD permit 20
R1(config)#router ospf 1
R1(config-route-map)#set tag 1
R1(config-router)#redistribute rip subnets route-map ADD
85.
A router receiving BGP routing updates from multiple neighbors for routers in AS 690. What is the reason that the router still sends traffic that is destined to AS 690 to a neighbor other than 10.222.1.1?
86.
An engineer received a ticket about a router that has reloaded. The monitoring system graphs show different traffic patterns between logical and physical interfaces when the router is rebooted. Which action resolves the issue?
87.
An engineer is troubleshooting a failed Telnet session from PC to the DHCP server. Which action resolves the issue?
88.
Which method provides failure detection in BFD?
89.
R1 cannot establish a neighbor relationship with R2 Which action resolves the issue"?
90.
The network administrator configured the branch router for IPv6 on the E 0/0 interface The neighboring router is fully configured to meet requirements, but the neighbor relationship is not coming up. Which action fixes the problem on the branch router to bring the IPv6 neighbors up?
91.
After applying IPsec, the engineer observed that the DMVPN tunnel went down, and both spoke-to-spoke and hub were not establishing. Which two actions resolve the issue? (Choose two.)
92.
A customer requested a GRE tunnel through the provider network between two customer sites using loopback to hide internal networks. Which configuration on R2 establishes the tunnel with R1?
A.
R2(config)# interface Tunnel 1
R2(config-if)# ip address 172.20.1.2 255.255.255.0
R2(config-if)#ip mtu 1400
R2(config-if)# ip tcp adjust-mss 1360
R2(config-if)# tunnel source 192.168.20.1
R2(config-if)# tunnel destination 192.168.10.1
93.
The network administrator configured CoPP so that all routing protocol traffic toward the router CPU is
limited to 1 mbps. All traffic that exceeds
this limit must be dropped. The router is running BGP and OSPF Management traffic for Telnet
and SSH
must be limited to 500kbps.
access-list 100 permit tcp any any eq 179
access-list 100 permit tcp any any range 22 23
access-list 100 permit ospf any any
!
class-map CM-ROUTING
match access-group 100
class-map CM-MGMT
match access-group 100
!
policy-map PM-COPP
class CM-ROUTING
police 1000000 conform-action transmit
class CM-MGMT
police 500000 conform-action transmit
!
control-plane
service-policy output PM-COPP
No traffic is filtering through CoPP,which is resulting in high CPU utilization,which configuration
resolves
the issue ?
94.
Which feature drops packets if the source address is not found in the snooping table?
95.
Routers R1 and R2 have established a network adjacency using EIGRP, and both routers are advertising subnets to its neighbor. After issuing the show ip EIGRP topology all-links command in R1, some prefixes are no showing R2 as a successor. Which action resolves the issue?
96.
A network administrator configured an IPv6 access list to allow TCP return traffic only, but it is not working as expected. Which changes resolve this issue?
ipv6 access-list inbound
permit tcp any any
deny ipv6 any any log
!
interface gio/0
ipv6 traffic-filter inbound out
97.
An engineer configured SNMP notifications sent to the management server using authentication and encrypting data with DES. An error in the response PDU is received as "UNKNOWNUSERNAME. WRONGDIGEST". Which action resolves the issue
98.
an engineer is trying to get 192.168.32.100 forwarded through 10.1.1.1, but it was forwarded through 10.1.1.2. What action forwards the packets through 10.1.1.1?
99.
A network engineer notices that R1 and R2 cannot establish an eBGP peering. The following messages appear in the log:
100.
When DMVPN is configured, which configuration allows spoke-to-spoke communication using loopback as a tunnel source?
101.
What is a function of BFD?
102.
R1 and R2 are configured for EIGRP peering using authentication and the neighbors failed to come up. Which action resolves the issue?
