300-410 Layer 3 Technologies Practice Question
A network engineer is configuring EIGRP on a Cisco router. The router has two interfaces: GigabitEthernet0/0 with IP address 10.1.1.1/24 and GigabitEthernet0/1 with IP address 10.2.2.1/24. The engineer wants to advertise both networks into EIGRP AS 100. Which configuration command is required to enable EIGRP on the interfaces?
⚠ Common exam trap
The trap here is using a single network statement with a classful mask or no wildcard mask, which either enables EIGRP on too many interfaces or is invalid syntax.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
network 10.1.1.0 0.0.0.255 and network 10.2.2.0 0.0.0.255
To enable EIGRP for IPv4 on interfaces, you use the network command under router eigrp with a wildcard mask. Each network statement specifies a range of addresses; the wildcard mask 0.0.0.255 matches a /24 subnet. Two statements are needed to cover both 10.1.1.0/24 and 10.2.2.0/24. The other options are either too broad, invalid syntax, or for IPv6.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
network 10.1.1.0 0.0.0.255 and network 10.2.2.0 0.0.0.255
Why this is correct
EIGRP uses the network command with a wildcard mask to specify which interfaces participate in EIGRP. To advertise both 10.1.1.0/24 and 10.2.2.0/24, you need two network statements: one for each subnet. The wildcard mask 0.0.0.255 matches the /24 subnet. This configuration enables EIGRP on both interfaces and advertises the connected networks. This is the correct and specific way to achieve the goal.
- ✗
network 10.0.0.0
Why it's wrong here
The command network 10.0.0.0 without a wildcard mask is not valid in EIGRP because EIGRP requires a wildcard mask to specify the range of addresses. In OSPF, you can use network 10.0.0.0 0.0.0.255 area 0, but EIGRP uses a different syntax. This command would be rejected or interpreted incorrectly. Therefore, it does not correctly enable EIGRP on the interfaces.
- ✗
ipv6 eigrp 100 on each interface
Why it's wrong here
The command ipv6 eigrp 100 is used to enable EIGRP for IPv6 on an interface, not for IPv4. Since the interfaces have IPv4 addresses and the goal is to advertise IPv4 networks, this command is incorrect. EIGRP for IPv4 is enabled using the network command under router eigrp. Using ipv6 eigrp would not activate EIGRP for IPv4 and would not advertise the specified IPv4 networks.
- ✗
network 10.0.0.0 0.255.255.255
Why it's wrong here
The command network 10.0.0.0 0.255.255.255 under router eigrp 100 would match all interfaces with IP addresses in the 10.0.0.0/8 range. However, this is not the most specific and could enable EIGRP on unintended interfaces. While it would enable EIGRP on the two interfaces, it is not the best practice because it might include other interfaces in the 10.0.0.0/8 range. The question asks for the required command to advertise both networks, and a more specific wildcard mask is preferred.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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