1. Which two protocols are allowed to be routed by EIGRP as a consequence of the PDM feature? (Choose two.)
- IPv4
- TCP
- IPv6
- UDP
- RTP
Explanation: Protocol-dependent modules (PDM) allow EIGRP to route for various Layer 3 protocol packets. TCP and UDP are Layer 4 protocols and RTP is used by EIGRP to guarantee delivery of packets.
2. Which bandwidth value is used when calculating the EIGRP metric of a route?
- the fastest bandwidth of all interfaces on the router
- the slowest bandwidth of all interfaces on the router
- the fastest bandwidth of all outgoing interfaces between the source and destination
- the slowest bandwidth of all outgoing interfaces between the source and destination
Explanation: The bandwidth factor that is used to calculate the composite metric of the EIGRP is defined as the slowest bandwidth of all outgoing interfaces between the source and destination.
3. Refer to the exhibit. Which statement describes the result of the last entry in the exhibited configuration?
- The routing table will include up to four unequal-cost routes learned via EIGRP.
- The routing table will include any route learned via EIGRP with a metric less than four times the successor metric.
- The routing table will include up to two equal-cost routes learned via EIGRP for the two advertised networks.
- The routing table will include all routes learned via EIGRP with a metric less than four times the feasible distance of the advertised networks.
Explanation: With the variance 4 command, the 4 indicates the routing table will include any route learned via EIGRP which has a metric that is less than four times the metric of the successor route.
4. What is the administrative distance of externally learned EIGRP routes?
- 170
- 90
- 110
- 120
Explanation: There are multiple administrative distances assigned to EIGRP routes. An administrative distance of 170 is used for external EIGRP routes, which could be routes learned from another routing protocol and redistributed into EIGRP.
5. Which protocol is used by EIGRP for delivering and receiving EIGRP packets?
- RTP
- TCP
- UDP
- ICMP
Explanation: There are five packet types used by EIGRP:
- Hello
- Update
- Request
- Query
- Reply
These packets are sent using the Reliable Transport Protocol (RTP) for either reliable or unreliable delivery to neighbor routers.
6. Which destination MAC address is used when a multicast EIGRP packet is encapsulated into an Ethernet frame?
- 01-00-5E-00-00-09
- 01-00-5E-00-00-10
- 01-00-5E-00-00-0A
- 01-00-5E-00-00-0B
Explanation: When an EIGRP multicast packet is encapsulated into an Ethernet frame, the destination MAC address is 01-00-5E-00-00-0A.
7. Which two parameters are used by EIGRP as metrics to select the best path to reach a network? (Choose two.)
- hop count
- bandwidth
- jitter
- resiliency
- delay
- confidentiality
Explanation: EIGRP uses bandwidth, delay, load, and reliability as metrics for selecting the best path to reach a network.
8. What are three features of EIGRP? (Choose three.)
- uses the Shortest Path First algorithm
- establishes neighbor adjacencies
- uses the Reliable Transport Protocol
- sends full routing table updates periodically
- broadcasts updates to all EIGRP routers
- supports equal and unequal cost load balancing
Explanation: EIGRP uses the DUAL algorithm, sends partial and bounded updates, and multicasts updates to other EIGRP routers.
9. Which three metric weights are set to zero by default when costs are being calculated using the EIGRP classic metric? (Choose three.)
- K1
- K2
- K3
- K4
- K5
- K6
Explanation: In the cost calculation by the EIGRP classic metric, the weights K1 and K3 are set to one, and K2, K4, and K5 are set to zero by default. The weight K6 is used for EIGRP wide metric calculation.
10. Refer to the exhibit. Which command was used to generate this output?
- show ip eigrp neighbors
- show ip eigrp topology all-links
- show ip eigrp traffic
- show ip protocols
Explanation: This command is used to verify which routing protocol is configured, the AS number, and whether automatic summarization is enabled.
11. What two conditions will result in an EIGRP route going into the active state? (Choose two.)
- One neighbor has not met the feasibility condition.
- The router is not sending queries.
- The successor is down.
- There is no feasible successor.
- The network has been recalculated.
Explanation: If a successor is no longer available, and there is no feasible successor, an EIGRP route will be put into the active state while the router actively searches for a new path to the destination.
“Do I Know This Already?” Quiz Answers:
1. EIGRP uses protocol number ____ for inter-router communication.
- 87
- 88
- 89
- 90
Explanation: EIGRP uses protocol number 88 for inter-router communication.
2. How many packet types does EIGRP use for inter-router communication?
- Three
- Four
- Five
- Six
- Seven
Explanation: EIGRP uses the hello, request, reply, update, and query packet types.
3. Which of the following is not required to match to form an EIGRP adjacency?
- Metric K values
- Primary subnet
- Hello and hold timers
- Authentication parameters
Explanation: The hello and hold timers can vary from neighbor to neighbor, as long as the hello packets are advertised before the hold timer expires.
4. What is an EIGRP successor?
- The next-hop router for the path with the lowest path metric for a destination prefix
- The path with the lowest metric for a destination prefix
- The router selected to maintain the EIGRP adjacencies for a broadcast network
- A route that satisfies the feasibility condition where the reported distance is less than the feasible distance
Explanation: An EIGRP successor is the next-hop router for the successor route (which is the loop-free route with the lowest path metric).
5. What attributes does the EIGRP topology table contain? (Choose all that apply.)
- Destination network prefix
- Hop Count
- Total path delay
- Maximum path bandwidth
- List of EIGRP neighbors
Explanation: The EIGRP topology table contains the destination network prefix, path attributes (hop count, minimum path bandwidth, total path delay), and a list of nearby EIGRP neighbors.
6. What destination addresses does EIGRP use when feasible? (Choose two.)
- IP address 224.0.0.9
- IP address 224.0.0.10
- IP address 224.0.0.8
- MAC address 01:00:5E:00:00:0A
- MAC address 0C:15:C0:00:00:01
Explanation: EIGRP uses multicast IP address 224.0.0.10 or MAC address 01:005E:00:00:0A when feasible.
7. The EIGRP process is initialized by which of the following technique? (Choose two.)
- Using the interface command ip eigrp as-number ipv4 unicast
- Using the global configuration command router eigrp as-number
- Using the global configuration command router eigrp process-name
- Using the interface command router eigrp as-number
Explanation: The EIGRP process is initialized with the global configuration command router eigrp as-number (classic configuration) or router eigrp process-name (named mode configuration).
8. True or false: The EIGRP router ID (RID) must be configured for EIGRP to be able to establish neighborship.
- True
- False
Explanation: False, the EIGRP RID dynamically selects an IPv4 address as the RID.
9. True or false: When using MD5 authentication between EIGRP routers, the key-chain sequence number can be different, as long as the password is the same.
- True
- False
Explanation: False, the key-chain sequence number is a component of the hash that is built with the password.
10. Which value can be modified on a router to manipulate the path taken by EIGRP but does not have impacts on other routing protocols, like OSPF?
- Interface bandwidth
- Interface MTU
- Interface delay
- Interface priority
Explanation: The interface delay can be modified to change EIGRP path calculations without the path calculations of OSPF.