u/StarGazer941

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 in its routing table:

• 192.168.8.0/24 via static route, AD 1
• 192.168.8.0/25 via OSPF, AD 110
• 192.168.8.64/26 via EIGRP, AD 90
• 192.168.8.64/27 via RIP, AD 120

A packet is destined for 192.168.8.70.

Which route will the router use?

A. 192.168.8.0/24 via static route
B. 192.168.8.0/25 via OSPF
C. 192.168.8.64/26 via EIGRP
D. 192.168.8.64/27 via RIP

Question 2 – Spanning Tree Protocol

A switch receives two BPDUs advertising the same root bridge, same root path cost, and same sender bridge ID.

The BPDU details are:

• Gi0/1 receives a BPDU with sender port ID 128.1
• Gi0/2 receives a BPDU with sender port ID 128.2

Which port will be selected as the root port?

A. Gi0/1, because it received the lower sender port ID
B. Gi0/2, because it received the higher sender port ID
C. Both ports will become root ports
D. Neither port will be used because this creates a loop

Question 3 – EtherChannel

Two switches are connected with four links. The administrator wants to form an LACP EtherChannel.

SW1 is configured with:

channel-group 1 mode active

SW2 is configured with:

channel-group 1 mode on

What is the expected result?

A. The EtherChannel forms successfully using LACP
B. The EtherChannel forms successfully using PAgP
C. The EtherChannel may fail because one side is using LACP and the other is forced on
D. The links automatically become routed ports

Question 4 – ACL Processing

A router has the following ACL configured:

access-list 10 deny 192.168.10.0 0.0.0.255
access-list 10 permit 192.168.10.50 0.0.0.0
access-list 10 permit any

A packet arrives from source IP 192.168.10.50.

What happens to the packet?

A. It is permitted because there is a specific permit statement for 192.168.10.50
B. It is denied because the first matching ACL statement denies the entire 192.168.10.0/24 network
C. It is permitted because permit any overrides the deny statement
D. It is checked against all ACL entries before the router decides

Bonus Mini Lab – Inter-VLAN Routing Troubleshooting

A small office has two VLANs:

• VLAN 10: 192.168.10.0/24
• VLAN 20: 192.168.20.0/24

A Layer 3 switch is being used for inter-VLAN routing.

PC1 in VLAN 10 has:

• IP address: 192.168.10.50
• Default gateway: 192.168.10.1

PC2 in VLAN 20 has:

• IP address: 192.168.20.50
• Default gateway: 192.168.20.1

The switch has the following configuration:

interface vlan 10
ip address 192.168.10.1 255.255.255.0
no shutdown

interface vlan 20
ip address 192.168.20.1 255.255.255.0
no shutdown

Both PCs can ping their own default gateway, but PC1 cannot ping PC2.

Answer the following:

1. What command is likely missing on the Layer 3 switch?
2. Why can the PCs ping their gateways but not each other?
3. What command could you use to verify whether the switch is routing between VLANs?

Please share your answers and explain your reasoning where possible.

#CCNA #Cisco #Networking #Subnetting #QOTW

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 / Equal-Cost Paths

A router learns the route 192.168.50.0/24 from the following sources:

• OSPF via Router A, AD 110, cost 20
• OSPF via Router B, AD 110, cost 20
• RIP, AD 120, metric 2
• Floating static route, AD 200

Which route or routes will be installed in the routing table?

A. The floating static route, because static routes are always preferred
B. The RIP route, because its metric value is lower
C. Both OSPF routes, because they have the lowest administrative distance and equal cost
D. Only one OSPF route, because routers cannot install multiple routes to the same prefix

Question 2 – HSRP

Two routers are configured with HSRP to provide default gateway redundancy for a VLAN.

Which IP address should the end-user PCs use as their default gateway?

A. The physical IP address of the active router
B. The physical IP address of the standby router
C. The HSRP virtual IP address
D. The broadcast address of the subnet

Question 3 – Switching

A switch receives an Ethernet frame. The source MAC address is learned, but the destination MAC address is not found in the MAC address table.

What will the switch do?

A. Drop the frame
B. Flood the frame out all ports in the same VLAN except the port it came in on
C. Send the frame only to the default gateway
D. Broadcast the frame to every VLAN on the switch

Question 4 – VLAN Trunking

Switch 1 has a trunk port configured with native VLAN 99. Switch 2 has the connected trunk port configured with native VLAN 1.

What is the issue?

A. The trunk will automatically become an access port
B. A native VLAN mismatch can occur, causing untagged traffic to be placed into different VLANs
C. All VLANs will be removed from the trunk
D. Only routed ports are affected by native VLAN settings

Bonus Mini Lab – VLAN Troubleshooting

Two switches are connected together using interface Gi0/1.

PC1 is connected to SW1 in VLAN 10.
PC2 is connected to SW2 in VLAN 10.

Both PCs are in the same IP subnet, but they cannot ping each other.

You check the trunk links and see the following:

SW1

Gi0/1 is trunking
Allowed VLANs: 10,20

SW2

Gi0/1 is trunking
Allowed VLANs: 20

Answer the following:

1. What is the most likely issue?
2. Which VLAN is missing from the trunk on SW2?
3. What command could be used to allow VLAN 10 on the trunk?
4. What command could you use to verify the trunk VLANs afterward?

Please share your answers and explain your reasoning where possible.

#CCNA #Cisco #Networking #Subnetting #QOTW

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:

• 10.1.0.0/16 via OSPF, AD 110
• 10.1.20.0/24 via RIP, AD 120
• 10.1.20.128/25 via EIGRP, AD 90
• 10.1.20.160/27 via static route, AD 200

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

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:

• 10.1.0.0/16 via OSPF, AD 110
• 10.1.20.0/24 via RIP, AD 120
• 10.1.20.128/25 via EIGRP, AD 90
• 10.1.20.160/27 via static route, AD 200

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

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 – Default Gateway

A PC has the following configuration:

• IP address: 192.168.10.25
• Subnet mask: 255.255.255.0
• Default gateway: 192.168.20.1

The PC can communicate with devices in its own subnet, but cannot reach remote networks.

What is the most likely issue?

A. The subnet mask is too large
B. The default gateway is not in the same subnet as the PC
C. The PC needs a public IP address
D. The switch port must be configured as a trunk

Question 2 – OSPF

A router has several loopback interfaces configured, but no OSPF router ID has been manually set.

How does the router choose its OSPF router ID?

A. Lowest active physical interface IP address
B. Highest active physical interface IP address
C. Lowest loopback interface IP address
D. Highest loopback interface IP address

Question 3 – VLANs

Two PCs are connected to the same switch but assigned to different VLANs. They are in different IP subnets.

What is required for the two PCs to communicate with each other?

A. A crossover cable
B. Inter-VLAN routing
C. PortFast
D. A native VLAN mismatch

Question 4 – Network Services

Which protocol is used to automatically assign IP addresses and other network settings to hosts?

A. DNS
B. DHCP
C. SNMP
D. NTP

Bonus Question – Subnetting

A host has the IP address 172.20.15.130/26.

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

A.

• Network: 172.20.15.64
• Usable range: 172.20.15.65–172.20.15.126
• Broadcast: 172.20.15.127

B.

• Network: 172.20.15.128
• Usable range: 172.20.15.129–172.20.15.190
• Broadcast: 172.20.15.191

C.

• Network: 172.20.15.128
• Usable range: 172.20.15.129–172.20.15.254
• Broadcast: 172.20.15.255

D.

• Network: 172.20.15.130
• Usable range: 172.20.15.131–172.20.15.190
• Broadcast: 172.20.15.191

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 – Routing

A router has the following routes in its routing table:

• 192.168.10.0/24 via OSPF
• 192.168.10.0/26 via EIGRP
• 192.168.10.64/26 via static route
• 192.168.0.0/16 via RIP

A packet is destined for 192.168.10.70.

Which route will the router use?

A. 192.168.10.0/24 via OSPF
B. 192.168.10.0/26 via EIGRP
C. 192.168.10.64/26 via static route
D. 192.168.0.0/16 via RIP

Question 2 – Spanning Tree Protocol

A switch receives a BPDU that claims to have a better path to the root bridge than the current port’s path.

What does STP use first when selecting the best path to the root bridge?

A. Lowest sender MAC address
B. Lowest root path cost
C. Highest port number
D. Highest bridge priority

Question 3 – IPv4 Addressing

Which IPv4 address range is reserved for APIPA/link-local addressing?

A. 10.0.0.0/8
B. 172.16.0.0/12
C. 169.254.0.0/16
D. 192.168.0.0/16

Question 4 – Network Devices

Which device primarily separates broadcast domains?

A. Hub
B. Layer 2 switch
C. Router
D. Access point

Bonus Question – Subnetting

A host has the IP address 192.168.25.173/29.

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

A.

• Network: 192.168.25.168
• Usable range: 192.168.25.169–192.168.25.174
• Broadcast: 192.168.25.175

B.

• Network: 192.168.25.160
• Usable range: 192.168.25.161–192.168.25.174
• Broadcast: 192.168.25.175

C.

• Network: 192.168.25.172
• Usable range: 192.168.25.173–192.168.25.178
• Broadcast: 192.168.25.179

D.

• Network: 192.168.25.176
• Usable range: 192.168.25.177–192.168.25.182
• Broadcast: 192.168.25.183

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 – Port Security

A switch access port is configured with the following:

• Port security enabled
• Maximum MAC addresses: 2
• Violation mode: restrict

Two valid MAC addresses have already been learned on the port. A third unknown device is connected.

What will happen?

A. The port will immediately shut down
B. The third MAC address will be added automatically
C. Traffic from the third MAC address will be dropped, but the port will stay up
D. All traffic on the port will be forwarded normally

Question 2 – Inter-VLAN Routing

A router is configured with subinterfaces for VLAN 10 and VLAN 20 using router-on-a-stick.

What must the switch port connected to the router be configured as?

A. Access port in VLAN 10
B. Trunk port
C. Routed port
D. Access port in VLAN 20

Question 3 – Ethernet Forwarding

A PC wants to send traffic to a server on a different IP subnet.

What destination MAC address will the PC use in the Ethernet frame?

A. The server’s MAC address
B. The broadcast MAC address
C. The default gateway’s MAC address
D. The DNS server’s MAC address

Question 4 – IPv6

Which ICMPv6 message is used by routers to advertise IPv6 prefix and default gateway information to hosts?

A. Neighbor Solicitation
B. Router Advertisement
C. Echo Request
D. Destination Unreachable

Bonus Question – Subnetting

A host has the IP address 10.20.30.200/26.

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

A.

• Network: 10.20.30.128
• Usable range: 10.20.30.129–10.20.30.190
• Broadcast: 10.20.30.191

B.

• Network: 10.20.30.192
• Usable range: 10.20.30.193–10.20.30.254
• Broadcast: 10.20.30.255

C.

• Network: 10.20.30.200
• Usable range: 10.20.30.201–10.20.30.254
• Broadcast: 10.20.30.255

D.

• Network: 10.20.30.192
• Usable range: 10.20.30.193–10.20.30.222
• Broadcast: 10.20.30.223

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 – 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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