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EIGRP uses protocol number ______ in the IP header.
EIGRP uses protocol number 88.
What is the difference between a successor and a feasible successor in EIGRP?
A successor is the primary best route to a destination placed in the routing table. A feasible
successor is a loop-free backup route stored in the topology table that satisfies the feasibility
condition.
A router receives an EIGRP route advertisement with a lower reported distance than its feasible
distance. What does this indicate?
This indicates the route satisfies the feasibility condition and may become a feasible successor
because the advertised path is loop-free.
Which command verifies EIGRP neighbors on a Cisco router?
show ip eigrp neighbors verifies adjacency formation, uptime, hold timers, retransmissions, and
sequence numbers.
EIGRP sends periodic full routing table updates every 30 seconds. Explain.
False. EIGRP sends partial and bounded updates only when topology changes occur. Hello
packets are periodic, but routing updates are event-driven.
What are the default hello and hold timers for EIGRP on high-speed links?
Hello timer is 5 seconds and hold timer is 15 seconds on links faster than T1.
Which metric components does EIGRP use by default?
By default, EIGRP uses bandwidth and delay for metric calculation. Reliability and load are
available but disabled unless manually configured.
Explain the feasibility condition in EIGRP.
A neighbor becomes a feasible successor if its reported distance to the destination is lower
than the local router's feasible distance, ensuring loop-free routing.
Which command enables EIGRP on a Cisco router?
router eigrp <ASN> enables the EIGRP routing process for a specified Autonomous System
Number.
A router shows "Active" routes for an extended period. What issue may exist?
This may indicate a Stuck-in-Active (SIA) condition caused by delayed responses, network
congestion, or unreachable neighbors during route recalculation.
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What is the function of the EIGRP topology table?
The topology table stores all learned EIGRP routes including successors and feasible
successors before the best route is installed into the routing table.
EIGRP uses multicast address ______ for updates.
EIGRP uses multicast address 224.0.0.10.
Why is unequal-cost load balancing considered an advantage of EIGRP?
EIGRP can distribute traffic across multiple paths with different metrics using the variance
command, improving bandwidth utilization and redundancy.
Which command is used to verify EIGRP routes in the routing table?
show ip route eigrp displays routes learned through EIGRP.
What does the "D" code represent in the Cisco routing table?
"D" represents routes learned through EIGRP.
What is the administrative distance of internal EIGRP routes?
Internal EIGRP routes have an administrative distance of 90.
What is the administrative distance of external EIGRP routes?
External EIGRP routes have an administrative distance of 170.
A network engineer forgets to advertise a subnet in EIGRP. Which command is likely missing?
The network command identifying the subnet under the EIGRP routing process is likely
missing.
Which show command displays all EIGRP topology information?
show ip eigrp topology displays successors, feasible successors, metrics, and route states.
Explain passive-interface usage in EIGRP.
The passive-interface command prevents EIGRP hello packets from being sent on specified
interfaces while still advertising connected networks. It improves security and reduces
unnecessary adjacencies.
EIGRP supports VLSM and CIDR. Explain.
True. EIGRP is a classless routing protocol that supports subnet masks in routing updates,
allowing VLSM and CIDR implementation.
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EIGRP uses protocol number ______ in the IP header.
EIGRP uses protocol number 88.
What is the difference between a successor and a feasible successor in EIGRP?
A successor is the primary best route to a destination placed in the routing table. A feasible
successor is a loop-free backup route stored in the topology table that satisfies the feasibility
condition.
A router receives an EIGRP route advertisement with a lower reported distance than its feasible
distance. What does this indicate?
This indicates the route satisfies the feasibility condition and may become a feasible successor
because the advertised path is loop-free.
Which command verifies EIGRP neighbors on a Cisco router?
show ip eigrp neighbors verifies adjacency formation, uptime, hold timers, retransmissions, and
sequence numbers.
EIGRP sends periodic full routing table updates every 30 seconds. Explain.
False. EIGRP sends partial and bounded updates only when topology changes occur. Hello
packets are periodic, but routing updates are event-driven.
What are the default hello and hold timers for EIGRP on high-speed links?
Hello timer is 5 seconds and hold timer is 15 seconds on links faster than T1.
Which metric components does EIGRP use by default?
By default, EIGRP uses bandwidth and delay for metric calculation. Reliability and load are
available but disabled unless manually configured.
Explain the feasibility condition in EIGRP.
A neighbor becomes a feasible successor if its reported distance to the destination is lower
than the local router's feasible distance, ensuring loop-free routing.
Which command enables EIGRP on a Cisco router?
router eigrp <ASN> enables the EIGRP routing process for a specified Autonomous System
Number.
A router shows "Active" routes for an extended period. What issue may exist?
This may indicate a Stuck-in-Active (SIA) condition caused by delayed responses, network
congestion, or unreachable neighbors during route recalculation.
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What is the function of the EIGRP topology table?
The topology table stores all learned EIGRP routes including successors and feasible
successors before the best route is installed into the routing table.
EIGRP uses multicast address ______ for updates.
EIGRP uses multicast address 224.0.0.10.
Why is unequal-cost load balancing considered an advantage of EIGRP?
EIGRP can distribute traffic across multiple paths with different metrics using the variance
command, improving bandwidth utilization and redundancy.
Which command is used to verify EIGRP routes in the routing table?
show ip route eigrp displays routes learned through EIGRP.
What does the "D" code represent in the Cisco routing table?
"D" represents routes learned through EIGRP.
What is the administrative distance of internal EIGRP routes?
Internal EIGRP routes have an administrative distance of 90.
What is the administrative distance of external EIGRP routes?
External EIGRP routes have an administrative distance of 170.
A network engineer forgets to advertise a subnet in EIGRP. Which command is likely missing?
The network command identifying the subnet under the EIGRP routing process is likely
missing.
Which show command displays all EIGRP topology information?
show ip eigrp topology displays successors, feasible successors, metrics, and route states.
Explain passive-interface usage in EIGRP.
The passive-interface command prevents EIGRP hello packets from being sent on specified
interfaces while still advertising connected networks. It improves security and reduces
unnecessary adjacencies.
EIGRP supports VLSM and CIDR. Explain.
True. EIGRP is a classless routing protocol that supports subnet masks in routing updates,
allowing VLSM and CIDR implementation.
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