Cisco 300-410: Implementing Cisco Enterprise Advanced Routing and Services (ENARSI)

Last checked October 22, 2026 against the official Cisco exam page.

1. Question 1Layer 3 technologies

   Two OSPF routers on the same segment are both connected, and an engineer wants a specific router to become the designated router. Which setting most directly influences the DR election?

   1. AThe hostname length
   2. BThe MTU of a loopback interface
   3. CThe OSPF interface priority
   4. DThe interface description
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   Correct answer: C

   OSPF elects the DR using the highest interface priority, with the router ID as a tiebreaker. Interface descriptions, hostnames, and loopback MTU do not affect the election.

2. Question 2Infrastructure services

   A router must send system messages to a central logging server so that events can be reviewed later. Which protocol is used for this?

   1. ANTP only
   2. BTFTP only
   3. CDHCP
   4. DSyslog
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   Correct answer: D

   Syslog forwards log messages from network devices to a central collector. DHCP assigns addresses, NTP synchronizes time, and TFTP transfers files.

3. Question 3Infrastructure security

   A switch port must accept only a limited number of MAC addresses and shut down if an unknown device connects. Which feature provides this?

   1. ASpanning tree root guard
   2. BPort security
   3. CSyslog
   4. DDHCP snooping only
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   Correct answer: B

   Port security limits the number of MAC addresses on a port and can shut the port down on violation. DHCP snooping filters DHCP messages, root guard protects spanning tree, and syslog logs messages.

4. Question 4VPN technologies

   Which tunnelling protocol encapsulates IP packets with a simple header and is often combined with IPsec to protect the traffic?

   1. ASNMP
   2. BDNS
   3. CGRE
   4. DHTTP
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   Correct answer: C

   Generic Routing Encapsulation carries packets inside a tunnel and is commonly protected with IPsec. HTTP, SNMP, and DNS are application protocols rather than tunnelling encapsulation.

5. Question 5Troubleshooting

   A router has two routes to the same destination, one from OSPF and one from a static route. Which route is installed in the routing table, all else equal?

   1. AThe static route, because its administrative distance is lower than OSPF's
   2. BBoth routes are installed with equal preference by default, and traffic is shared
   3. CNeither route is installed, because the routing table rejects duplicate prefixes
   4. DThe OSPF route, because its distance of 110 is lower than the static route's distance
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   Correct answer: A

   Static routes have an administrative distance of 1 and OSPF has 110, so the static route wins when both exist. The OSPF statement is reversed, duplicates are not rejected, and the router selects one best route for installation.