Part 5.3

A user is unable to establish a TCP connection to a web server, but can successfully ping the server. Which of the following is the most likely cause of the issue?

• The user's subnet mask is incorrect

• The server's firewall is blocking TCP port 80

• The user's network cable is unplugged

• The user's computer has no IP address

A network administrator notices that devices in VLAN 10 cannot communicate with devices in VLAN 20. What is the most likely reason for this issue?

• The switch is powered off

• Inter-VLAN routing is not configured

• The devices have duplicate IP addresses

• The devices are using different subnet masks

A router is not forwarding packets to a specific network. Upon checking, you find that the routing table does not have an entry for that network. What should you do to resolve the issue?

• Add a static route for the missing network

• Change the subnet mask on all devices

• Reboot all switches

• Disable all VLANs

Two computers on the same network are unable to communicate. Both have the same IP address assigned. What is the result of this configuration?

• Both computers will function normally

• An IP address conflict will occur, causing network issues

• The computers will automatically change their IP addresses

• The computers will be assigned to different VLANs

A user is unable to access resources on a different subnet. The user's IP address is 192.168.1.10 with a subnet mask of 255.255.255.0, but the gateway is set to 192.168.2.1. What is the most likely cause of the problem?

• The subnet mask is too restrictive

• The default gateway is not in the same subnet as the user

• The user's IP address is invalid

• The VLAN is misconfigured

A network technician finds that devices in VLAN 30 are not receiving DHCP addresses. What should the technician check first?

• If the DHCP server is authorized

• If the DHCP server is connected to VLAN 30

• If the devices are using static IP addresses

• If the switch is powered on

A user reports intermittent connectivity issues. Upon investigation, you find that two devices have been assigned the same static IP address. What is the best way to resolve this issue?

• Change the subnet mask on both devices

• Assign a unique IP address to one of the devices

• Reboot the router

• Disable DHCP on the network

A network administrator notices that a switch port is not forwarding traffic and is instead blocking. Which protocol is most likely responsible for this behavior?

• TCP

• UDP

• STP (Spanning Tree Protocol)

• DHCP

A user is unable to connect to a server using a UDP-based application, but TCP connections work fine. What could be a possible cause?

• The server is not listening on the correct UDP port

• The user's subnet mask is incorrect

• The user's computer is not powered on

• The server's IP address is invalid

A network device is configured with an IP address of 10.0.0.5 and a subnet mask of 255.255.255.0. Another device is configured with 10.0.1.5 and the same subnet mask. Why can't these devices communicate directly?

• They are on different VLANs

• They are on different subnets

• Their IP addresses are invalid

• Their subnet masks are incorrect