Implementing Cisco Enterprise Advanced Routing and Services (ENARSI)
Exam Details
Exam Code
:300-410
Exam Name
:Implementing Cisco Enterprise Advanced Routing and Services (ENARSI)
Certification
:CCNP Enterprise
Vendor
:Cisco
Total Questions
:925 Q&As
Last Updated
:Mar 31, 2025
Cisco CCNP Enterprise 300-410 Questions & Answers
Question 111:
Your network team is assessing options available to translate IPv6 address to IPv4 addresses.
In which of the following scenarios is stateless NAT64 NOT supported as a solution?
A. translating from an IPv4 network to an IPv6 network
B. translating from an IPv6 network to an IPv4 network
C. translating from the IPv6 Internet to an IPv4 network
D. translating from an IPv6 network to the IPv4 Internet
Correct Answer: C
Stateless NAT64 does not support translating from the IPv6 Internet to an IPv4 network. NAT64 is a version of network address translation that translates IPv6 address to IPv4 and vice versa. It has two variants, stateless and stateful. In stateless translation, mappings are created using an algorithm, but those mappings are not maintained while translation is being performed. Stateful NAT64 both creates and maintains mappings during translation.
Due to the fact it does not maintain mappings, stateless NAT64 supports all of the options given except translating from the IPv6 Internet to an IPv4 network.
References: Home > Products and services > Cisco IOS and NX-OS software > Cisco IOS technologies > Enterprise ipv6 solution > Data sheets and literature > White papers > NAT64 Technology: Connecting IPv6 and IPv4 Networks > Technologies Facilitating IPv6/IPv4 Translation
Question 112:
You are implementing IP SLA and would like to use it to measure hop-by-hop response time between a Cisco router and any IP device on the network.
Which of the following IP SLA operations would you use for this?
A. ICMP path echo operation
B. Internet Control Message Protocol Echo Operation
C. UDP Jitter Operation for VoIP
D. UDP Jitter Operation
Correct Answer: A
The ICMP path echo operation discovers the path using the traceroute command, and then measures response time between the source router and each intermittent hop in the path. IP SLAs allow users to monitor network performance
between Cisco routers or from either a Cisco router to a remote IP device.
The Internet Control Message Protocol (ICMP) Echo Operation measures end-to-end response time between a Cisco router and any IP-enabled device. Response time is computed by measuring the time taken between sending an ICMP
echo request message to the destination and receiving an ICMP echo reply. It does not measure hop-by-hop response time.
The UDP Jitter Operation for VoIP is an extension to the current jitter operations with specific enhancements for VoIP. The enhancements allow this operation to calculate voice quality scores and simulate the codec's directly in CLI and the
MIB. It does not measure hop-by-hop response time.
The UDP Jitter Operation is designed to measure the delay, delay variance, and packet loss in IP networks by generating active UDP traffic. It does not measure hop-by-hop response time.
Objective:
Infrastructure Services
Sub-Objective:
Describe SLA architecture
References:
Home > Support > Technology support > IP > IP application services > Technology information > Technology white paper > Cisco IOS IP Service Level Agreements User Guide
Question 113:
You have implemented the following IP SLA configuration, as shown in the following partial output of the show run command:
ip sla 1 dns cow.cisco.com name-server 10.52.128.30 ip sla schedule 1 start-time now
Which of the following statements is true of this configuration?
A. it will find the response time to resolve the DNS name cow.cisco.com
B. it will find the response time to connect to the DNS server at 10.52.128.30
C. it will start in one minute
D. it will gather data from one minute
Correct Answer: A
It will find the response time to resolve the DNS name cow.cisco.com. Domain Name System (DNS) response time is computed by calculating the difference between the time taken to send a DNS request and the time a reply is received. The
Cisco IOS IP SLAs DNS operation queries for an IP address if the user specifies a hostname, or queries for a hostname if the user specifies an IP address.
It will not find the response time to connect to the DNS server at 10.52.128.30. That is the IP address of the DNS server being used for the operation (10.52.128.30). However, it will measure the response time to resolve the DNS name
cow.cisco.com.
It will not start in one minute. It will start immediately, as indicated by the start-time now parameter.
It will not gather data for one minute. The numeral 1 in the first line refers to the IP SLA number, and the numeral 1 in the last line refers to the IP SLA number to be scheduled.
Objective:
Infrastructure Services
Sub-Objective:
Configure and verify IP SLA
References:
Home > Support > Technology support > IP > IP application services > Technology information > Technology white paper > Cisco IOS IP Service Level Agreements User Guide
Question 114:
A TFTP server, a DNS server, and a TACACS server are residing in the 192.168.5.0/24 subnet. Their IP addresses are 192.168.5.2, 192.168.5.3, and 192.168.5.4, respectively.
You would like to configure the routers to forward UDP broadcasts to these servers.
Which of the following commands or sets of commands would configure this to occur using the LEAST number of commands?
A. ip helper-address 192.168.5.2 69 ip helper-address 192.168.5.3 53 ip helper-address 192.168.5.4 49
B. ip helper-address 192.168.5.2 ip helper-address 192.168.5.3 ip helper-address 192.168.5.4
C. ip helper-address 192.168.50 69 53 49
D. ip helper-address 192.168.5.255
Correct Answer: D
The only command required is ip helper-address 192.168.5.255. This command is a directed broadcast to the subnet on which the servers reside which will cause all servers to receive the broadcast. Each server will process only the packets aimed at the port on which they are listening.
It not necessary to specify any port numbers because the ip helper-address command will forward to the following ports by default: NTP - port 37 TACACs - port 49 DNS - port 53 BootP - port 67
TFTP - port 69
NetBIOS Name server - port 137
NetBIOS Datagram server - port 138
While the following command set would work, it does not contain the least number of commands:
ip helper-address 192.168.5.2 69
ip helper-address 192.168.5.3 53
ip helper-address 192.168.5.4 49
It is not required to specify each server and its respective port number.
The following command set would also have the desired results, because port numbers are not required for the default services:
ip helper-address 192.168.5.2
ip helper-address 192.168.5.3
ip helper-address 192.168.5.4
However, this is not the least number of commands you can execute to achieve the solution.
The command ip helper-address 192.168.50 69 53 49 would not work because it is addressed to the network number of the subnet to which the servers are connected. To send to them all requires a directed broadcast.
Objective:
Infrastructure Services
Sub-Objective:
Configure and verify IPv4 and IPv6 DHCP
References:
Cisco Press > Articles > Cisco Networking Academy > CCNP 1: Advanced IP Addressing Management Cisco > Cisco IOS IP Application Services Command Reference > ip helper-address
Question 115:
You are configuring Netflow and you are explaining its operation to your assistant. He wants to know what constitutes a flow.
Which of the following items are NOT used to distinguish one flow from another?
A. source IP address
B. destination IP address
C. source port number
D. Layer 2 protocol type
Correct Answer: D
Layer 2 protocol type is not used to distinguish one flow from another. A flow in Netflow refers to an individual communication session between two devices. A flow is defined by the combination of the following seven key fields:
Which command sets the OSPF priority value of a router interface to 10?
A. Router(config)# ospf priority 10
B. Router(config-if)# ospf priority 10
C. Router(config)# ip ospf priority 10
D. Router(config-if)# ip ospf priority 10
Correct Answer: D
The correct syntax for the ip ospf priority command is shown below:
Router(config-if)# ip ospf priority {number}
The number is a value from 0 to 255, and 1 is the default priority. A priority value of 0 means that the interface cannot be elected as the designated router (DR) or backup designated router (BDR). The higher the priority, the more preferred the
router is when there is an election for DR and BDR for that network.
NOTE: The ip ospf priority command is entered in interface configuration mode, not router configuration mode.
All other options either use incorrect syntax or are executed at an incorrect prompt.
Objective:
Layer 3 Technologies
Sub-Objective:
Configure and verify network types, area types, and router types
References:
Cisco IOS Master Command List, Release 12.4 > i through k > ip ospf priority
Question 117:
When configuring a DMVPN solution, which of the following technologies makes it possible for the spoke routers to use dynamic IP addressing?
A. IPsec
B. mGRE
C. NHRP
D. Dynamic routing protocols
Correct Answer: C
Next Hop Resolution Protocol (NHRP) allows the spoke routers to register their IP addresses with the NHRP server, which is the hub router. It also allows the spoke routers to then learn the physical IP addresses of the other spoke routers
from the hub router, allowing for GRE links to be built dynamically as needed between the spokes. This eliminates the need for the traffic to go through the hub router.
Dynamic Multipoint VPN (DMVPN) technology leverages the following associated technologies:
IPsec
mGRE
Dynamic routing protocols
NHRP
Cisco Express Forwarding
It makes it possible to build the hub router once, and add spokes later, making no additional changes to the hub. The spokes are able to register with the hub and dynamically build their own connections to other spokes using the IP addresses
learned from the hub using NHRP. DMVPN also allows IPsec point-to-point GRE tunnels to be built to new spokes with no IPsec peering configuration. The multipoint GRE technology (mGRE) allows a single physical interface on the hub to
be used for all spoke connections.
Finally, the routing protocols used by DMVPN allow the routers to share routing information, while Cisco Express Forwarding (CEF) is a switching technology that improves performance while reducing the load on the CPUs of the routers.
You have a DMVPN hub with the following configuration applied: What problem could occur if the bandwidth 1000 command were missing from the tunnel interface?
A. the tunnel interface will intermittently flap up and down
B. split horizon will prevent routing updates from traversing from spoke to spoke
C. congestion will develop in the tunnel interface
D. the IPsec association will fail
Correct Answer: A
In the absence of a bandwidth command on the tunnel interface, the default bandwidth on a tunnel interface is 9 Kbps. EIGRP will use 50% of that (4.5K), which is too low. This will cause problems with the maintenance of EIGRP neighbor
relationships. From time to time this will cause the tunnel to flap up and then down as the relationships go up and down. When you execute the bandwidth command it has no real effect on the bandwidth of the link but it will allow EIGRP to
use 50% of 10k or 5k for its purposes, leaving 4k for data. This will have little impact on the data while maintaining the neighbor relationships.
The bandwidth command will have no effect on split horizon. There will be no problems with split horizon, even though the output shows that it has been disabled on the tunnel interface with the no ip split-horizon eigrp 1 command.
The bandwidth command will not cause congestion on the link. It will only lower the bandwidth available to data from 4.5K to 4K.
The bandwidth command will not cause the IPsec association to fail. There is sufficient bandwidth for this process.
The following configuration was applied to the router R66:
What is the interface ID and the IP address of the subinterface created to host the virtual network named red? (Choose two.)
A. FastEthernet1/0/0.3
B. FastEthernet0/0/0.red
C. FastEthernet0/0/3
D. 10.1.1.3
E. 10.1.1.1
F. 10.0.0.3
Correct Answer: AE
The interface ID of the subinterface created to host the virtual network named red will be FastEthernet1/0/0.3, and the IP address will be 10.1.1.1. When a virtual routing and forwarding (VRF) instance is defined, it will have a name and a tag
number. The tag number is used by the router to dynamically create a subinterface on the specified physical interface of the EVN trunk. The tag number is appended to the physical interface ID. Since the virtual network (vnet) trunk was
defined as FastEthernet1/0/0, the subinterface for vrf red will be FastEthernet1/0/0.3. All subinterfaces on the trunk will use the same IP address as the physical interface defined as the trunk.
Easy virtual networking (EVN) is a technology that allows for multiple logical networks to use the same physical infrastructure. EVN trunks carry the traffic of multiple VRFs. While the subinterfaces dedicated to each VRF use the same IP
address (that of the physical interface of the EVN trunk), no IP address conflicts ever occur because each VRF maintains its own routing and forwarding tables, and while on the trunk, each uses a VRF tag to separate the traffic from each
You are troubleshooting an issue with the configuration of mGRE on the hub router in a hub-and-spoke configuration. Examine the output of the configuration of the tunnel interface on the hub router:
Which of the following statements is true?
A. The tunnel destination must be specified on the tunnel interface
B. the tunnel mode gre multipoint command must be executed on the tunnel interface
C. the tunnel mode gre multipoint command must be executed on the physical interface
D. The tunnel destination must be specified on the physical interface
Correct Answer: B
The tunnel mode gre multipoint command must be executed on the tunnel interface. An mGRE configuration is one in which the tunnel is allowed to have multiple destinations. The distinguishing feature between an mGRE interface and a
point-to-point GRE interface is the tunnel destination. While it is specified on a point-to-point GRE interface, it is not on an mGRE interface. Instead the command tunnel mode gre multipoint is executed on the tunnel interface. This allows the
interface to use the Next Hop Routing protocol (NHRP) to discover the IP addresses of the other tunnel endpoints.
The tunnel destination is not specified on the tunnel interface using mGRE. Instead the command tunnel mode gre multipoint is executed on the tunnel interface.
The tunnel mode gre multipoint command must be executed on the tunnel interface, not the physical interface. The tunnel destination is neither specified on the tunnel interface nor on the physical interface when using mGRE.
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