pfsense scenario QUESTIONS LVL1

Question 1

A PC has an IP address starting with 169.254.. What’s wrong?

Answer 1

The PC didn’t receive an IP from the DHCP server (APIPA assigned it).

Question 2

You can ping 8.8.8.8 but can’t open google.com. What’s the issue?

Answer 2

The DNS server is not working or not configured.

Question 3

Two PCs are on the same switch but can’t ping each other. What should you check first?

Answer 3

Check if they have correct IP addresses and are in the same subnet.

Question 4

After manually setting an IP, a PC loses internet. What could be wrong?

Answer 4

Wrong subnet mask, gateway, or DNS settings.

Question 5

A computer isn’t getting an IP address. What service should you check on the router?

Answer 5

Check if the DHCP server is enabled.

Question 6

The router is connected, but users can’t access the internet. What might be missing?

Answer 6

The default route or WAN settings may be misconfigured.

Question 7

A ping to the router works, but pinging 8.8.8.8 doesn’t. What’s the problem?

Answer 7

The router doesn’t have a route to the internet or NAT isn’t configured

Question 8

What is the default subnet mask for a Class C IP address?

Answer 8

255.255.255.0

Question 9

You connect two switches and they don’t link up. What kind of cable is needed?

Answer 9

A crossover cable (or auto-MDIX should be enabled).

Question 10

Devices in the same VLAN cannot communicate. What could be wrong?

Answer 10

VLAN configuration on the switch is incorrect or ports are not assigned properly.

Question 11

A PC can talk to other PCs, but not the internet. What’s likely missing?

Answer 11

The default gateway is not set correctly.

Question 12

You want to keep HR and IT networks separate. What should you configure?

Answer 12

VLANs.

Question 13

What command on Windows shows the MAC address of your network card?

Answer 13

ipconfig /all

Question 14

What command tests if a remote device is reachable on the network?

Answer 14

ping

Question 15

DHCP isn’t assigning addresses. What could be the issue?

Answer 15

The DHCP scope may be wrong or the service is disabled.

Question 16

Ping works, but websites won’t load. What could be the cause?

Answer 16

ort 80 or port 443 might be blocked.

Question 17

What port number does SSH use?

Answer 17

Port 22

Question 18

Static route isn’t working. What should you check?

Answer 18

Verify next-hop IP or exit interface.

Question 19

Two VLANs need to communicate. What do you need?

Answer 19

A router or Layer 3 switch (Inter-VLAN routing).

Question 20

Too many broadcast packets in your network. What’s the solution?

Answer 20

Use VLANs or subnets to reduce broadcast domains.