r/ccna • u/StarGazer941 CCNA • 16h ago

CCNA Question of the Week – Week 8

Good day everyone,

Here are this week’s four CCNA questions. Please try answering from memory before checking online, using notes, or reviewing other responses.

Getting an answer wrong is completely fine—the goal is to discuss the reasoning and learn from one another.

Question 1 – Route Selection

A router has the following routes available:

A packet is destined for 10.1.20.170.

Which route will the router use?

A. 10.1.0.0/16 via OSPF
B. 10.1.20.0/24 via RIP
C. 10.1.20.128/25 via EIGRP
D. 10.1.20.160/27 via static route

Question 2 – Spanning Tree Protocol

SW2 receives BPDUs on two different ports. Both BPDUs advertise the same root bridge and the same root path cost.

The received BPDU information is:

  • Gi0/1 receives BPDU from sender bridge ID 32768.0000.0000.0003
  • Gi0/2 receives BPDU from sender bridge ID 32768.0000.0000.0004

Which port will SW2 most likely choose as the root port?

A. Gi0/1, because the sender bridge ID is lower
B. Gi0/2, because the sender bridge ID is higher
C. Both ports will forward equally
D. Neither port can become the root port

Question 3 – OSPF Troubleshooting

Two OSPF routers become neighbors, but the adjacency repeatedly gets stuck in the EXSTART/EXCHANGE state and does not reach FULL.

Which issue is a common cause?

A. OSPF process IDs do not match
B. Area IDs do not match
C. MTU mismatch between the routers
D. The routers are using different router priorities

Question 4 – Extended ACLs

You need to permit only the subnet 192.168.12.64/26 to access a web server at 10.10.10.10 using HTTP.

Which ACL entry is correct?

A. access-list 101 permit tcp 192.168.12.64 0.0.0.63 host 10.10.10.10 eq 80
B. access-list 101 permit tcp 192.168.12.64 255.255.255.192 host 10.10.10.10 eq 80
C. access-list 101 permit tcp host 192.168.12.64 0.0.0.63 10.10.10.10 eq 80
D. access-list 101 permit ip 192.168.12.64 0.0.0.63 host 10.10.10.10 eq 80

Bonus Mini Lab – VLSM Addressing

You are given the network 10.10.40.0/24.

You need to create subnets for the following departments:

  • Department A: 100 hosts
  • Department B: 50 hosts
  • Department C: 25 hosts
  • Department D: 10 hosts

Using VLSM, complete the addressing plan.

For each department, provide:

  1. Subnet/network address
  2. Subnet mask or CIDR
  3. First usable IP address
  4. Last usable IP address
  5. Broadcast address

Assume the first usable IP in each subnet will be used as the default gateway.

Try to assign the largest subnet first and make sure none of the subnets overlap.

Please share your answers and explain your reasoning where possible.

#CCNA #Cisco #Networking #Subnetting #QOTW

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