Refer to the exhibit. If RTR01 is configured as shown, which three addresses will be received by other routers that are running EIGRP on the network? (Choose three.)
A, C and D
auto summary uses "classful boundary"
- 10.4.3.0 with mask 255.0.0.0 gives 10.0.0.0
- 172.16.4.0 with mask 255.255.0.0 gives 172.16.0.0
- 192.168.2.0 with mask 255.255.255.0 gives 192.168.2.0
Classless routing in EIGRP autosummary so
Class A 10.0.0.0 / 8
Class B 172.16.0.0 /16
Class C 192.168.x.0 /24
Gives answers A, C and D - tricky... I didn't study EIGRP as much since I thought the focus now was/is on OSPF
And you're right. EIGRP is not part of CCNA 200-301 while OSPFv2 is.
https://learningnetwork.cisco.com/s/ccna-exam-topics
3.4 Configure and verify single area OSPFv2
3.4.a Neighbor adjacencies
3.4.b Point-to-point
3.4.c Broadcast (DR/BDR selection)
3.4.d Router ID
C,D,F
Classification of IPv4 address:
- Class A -> use mask 255.0.0.0
- Class B -> use mask 255.255.0.0
- Class C -> use mask 255.255.255.0
classification of IPv4 PRIVATE ADDRESSES
Why A?
Be cause:
- Class A -> use mask 255.0.0.0
- Class B -> use mask 255.240.0.0
- Class C -> use mask 255.255.0.0
In the case of EIGRP (Enhanced Interior Gateway Routing Protocol), the auto-summary behavior is slightly different compared to RIP.
With auto-summary enabled in EIGRP, the router summarizes routes to classful boundaries at network edges rather than to specific subnets. For the IP address 192.168.2.0/24, EIGRP will announce the network 192.168.0.0/16 to neighbors outside of that network. However, if the router is directly connected to the 192.168.2.0/24 subnet and there is no need for summarization at the edge, it can still advertise the specific subnet 192.168.2.0/24 to neighbors.
Therefore, if you are using EIGRP with auto-summary enabled and the network 192.168.2.0/24 is directly connected to the router, the router might advertise the network 192.168.0.0/16 to neighbors outside this network, but for neighbors within the same network, it will advertise the specific subnet.
Correct: C,D,F
auto-summary is not widely used because it causes issues when there are huge network gaps. The network classifications are shown below:
Class A 10.0.0.0 - 10.255.255.255
Class B 172.16.0.0 - 172.31.255.255
Class C 192.168.0.0 -192.168.255.255
10.4.3.0 = Summaryzed to 10.0.0.0
172.16.4.0 = Summaryzed to 172.16.0.0
192.168.2.0 = Summarized to 192.168.0.0
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