u/StarGazer941

Good morning 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 – Spanning Tree Protocol

Three switches have the following bridge IDs:

• SW1: Priority `24576`, MAC address `00AA.0000.0003`
• SW2: Priority `24576`, MAC address `00AA.0000.0001`
• SW3: Priority `28672`, MAC address `00AA.0000.0002`

Which switch will become the STP root bridge?

A. SW1, because it was listed first

B. SW2, because it has the lowest bridge ID

C. SW3, because it has the highest priority value

D. SW1 and SW2 will share the root bridge role

Question 2 – EtherChannel

A network administrator is attempting to form an LACP EtherChannel between two switches.

Switch 1 is configured with LACP mode **active**, while Switch 2 is configured with LACP mode **passive**.

What will happen?

A. The EtherChannel will form successfully

B. The EtherChannel will not form because both sides must use active mode

C. The ports will form a PAgP EtherChannel

D. The ports will operate as separate trunk links

Question 3 – IPv6

Which IPv6 protocol or feature performs functions similar to ARP in IPv4?

A. DHCPv6

B. Neighbor Discovery Protocol

C. Router Advertisement Guard

D. EIGRP for IPv6

Question 4 – Access Control Lists

A standard IPv4 ACL is being used to block traffic from one source network while allowing all other traffic.

Where should the ACL generally be placed?

A. As close to the source as possible

B. As close to the destination as possible

C. Only on the default gateway

D. On every router interface in the path

Bonus Question – Subnetting

A host has the IP address `172.16.34.77/27`.

Which option correctly identifies the network address, usable host range, and broadcast address?

A.

• Network: `172.16.34.64`
• Usable range: `172.16.34.65–172.16.34.94`
• Broadcast: `172.16.34.95`

B.

• Network: `172.16.34.64`
• Usable range: `172.16.34.65–172.16.34.126`
• Broadcast: `172.16.34.127`

C.

• Network: `172.16.34.72`
• Usable range: `172.16.34.73–172.16.34.94`
• Broadcast: `172.16.34.95`

D.

• Network: `172.16.34.0`
• Usable range: `172.16.34.1–172.16.34.126`
• Broadcast: `172.16.34.127`

Please share your answers and explain your reasoning where possible.

#CCNA #Cisco #Networking #Subnetting #QOTW

Good morning 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 learned the following routes:

• 10.10.10.0/24 through OSPF, AD 110
• 10.10.10.0/25 through RIP, AD 120

Which route will the router use for a packet destined for 10.10.10.50?

A. The OSPF route because it has the lower administrative distance

B. The RIP route because it has the longer prefix length

C. Both routes will be installed and used equally

D. The packet will be dropped because the routes use different protocols

Question 2 – OSPF Neighbour Formation

Two directly connected routers can successfully ping each other, but they are not forming an OSPF neighbour relationship.

Which setting does not need to match between the two routers?

A. Area ID

B. Hello and dead timers

C. OSPF process ID

D. Authentication settings

Question 3 – VLAN Trunking

A trunk between two switches is operational. Devices in VLANs 10 and 20 can communicate across the trunk, but devices in VLAN 30 cannot.

Which command would be most useful to check first?

A. show ip route

B. show interfaces trunk

C. show spanning-tree root

D. show ip interface brief

Question 4 – ACL Wildcard Masks

Which wildcard mask should be used to match the subnet 192.168.10.64/27 in an access control list?

A. 0.0.0.15

B. 0.0.0.31

C. 0.0.0.63

D. 255.255.255.224

Bonus Question – VLSM

You have been assigned the network 192.168.50.0/24 and must create subnets for the following departments:

• Sales: 60 hosts
• Engineering: 30 hosts
• Administration: 12 hosts
• Management: 6 hosts

Using VLSM and assigning the largest subnet first, which of the following is a valid addressing plan?

A.

• Sales: 192.168.50.0/26
• Engineering: 192.168.50.64/27
• Administration: 192.168.50.96/28
• Management: 192.168.50.112/29

B.

• Sales: 192.168.50.0/27
• Engineering: 192.168.50.32/27
• Administration: 192.168.50.64/28
• Management: 192.168.50.80/29

C.

• Sales: 192.168.50.0/25
• Engineering: 192.168.50.128/26
• Administration: 192.168.50.192/27
• Management: 192.168.50.224/28

D.

• Sales: 192.168.50.0/26
• Engineering: 192.168.50.32/27
• Administration: 192.168.50.64/28
• Management: 192.168.50.80/29

Please share your answers and explain your reasoning where possible.

#CCNA #Cisco #Networking #QOTW

Good morning everyone,

Thank you to everyone who voted and shared feedback. Based on the responses, the group would like 4 CCNA questions per week.

The goal is not just to answer the questions, but to discuss the reasoning behind them. I’ll leave the questions open for a few days so everyone has a chance to respond, then I’ll post the answers with explanations. I may also pin the best explanation so others can learn from it.

Here are the Week 1 questions:

Question 1 – Routing Preference

Which route would be most preferred if all routes match the same prefix length?

A. Static route — AD 1

B. OSPF — AD 110

C. RIP — AD 120

D. Floating static route — AD 200

Question 2 – VLANs

A switchport is configured as an access port in VLAN 20. What type of traffic should normally be received from the connected end-user device?

A. Tagged traffic for VLAN 20

B. Untagged traffic

C. Trunk traffic for all VLANs

D. Only native VLAN traffic

Question 3 – STP

Which STP feature allows an access port connected to an end device to move to the forwarding state quickly?

A. Root Guard

B. BPDU Guard

C. PortFast

D. EtherChannel

Question 4 – Subnetting

How many usable host addresses are available in a /27 subnet?

A. 30

B. 32

C. 62

D. 64

Feel free to answer with your choices and, if possible, explain your reasoning.

Good morning everyone,

I am thinking of starting a CCNA Question of the week to help keep the group active and give everyone a chance to review key topics together.

A little about me: I have completed my CCNA and currently working towards my CCNP. I thought this could be a good way for us to study, discuss, and reinforce the fundamentals together.

The idea would be to post a few questions each week covering topics like subnet ting, VLANs, STP, OSPF, NAT, ACL, and troubleshooting.

Would this be helpful to the group? I am thinking 4 questions per week, but happy to adjust based on what works best for everyone.

Thank you

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