CCNA Network Protocols Questions

A technician is configuring a network for a branch office that will use a router to connect to the main office over the internet. The connection must be encrypted and authenticated to ensure data privacy. Which protocol should the technician configure on the router?

During a network security audit, a technician finds that an employee is using a protocol that allows remote control of a computer with full graphical interface but without encryption. Which protocol should be replaced with a more secure alternative?

During a network upgrade, a technician installs a new wireless access point. Users on the new AP can access local resources but cannot browse the internet. The technician verifies that the AP has a valid IP address and can ping an external website by IP address. Which protocol is most likely misconfigured?

A user complains that they cannot access any websites, but they can ping other devices on the local network by IP address. The network uses DHCP and DNS servers. Which protocol is most likely failing?

A network administrator notices that a managed switch is not reporting its status to the central monitoring system. The monitoring system uses a protocol that collects device information such as CPU load and interface errors. Which protocol is most likely not configured on the switch?

A technician is setting up a new web server that must be accessible from the internet using HTTPS. The server is behind a firewall that performs port forwarding. After configuration, external users cannot reach the server, but internal users can. Which protocol and port combination must be forwarded to the server?

A technician is troubleshooting a user's laptop that cannot obtain an IP address via DHCP. The laptop shows an Automatic Private IP Addressing (APIPA) address of 169.254.x.x. Other devices on the same network obtain IPs correctly. Which protocol should the technician verify is functioning on the laptop?

During a network upgrade, a technician needs to ensure that all devices on a small office LAN receive IP addresses automatically from a central server. Which protocol must be running on that server?

A company deploys a new file server that uses SMB protocol for file sharing. Users on Windows 10 can connect to the server, but users on older Windows 7 machines cannot. The server is configured to require SMB 3.0 encryption. Which protocol version mismatch is causing the issue?

During a network upgrade, a technician configures a new VoIP phone to use a dedicated VLAN for voice traffic. After connecting the phone to a switch port configured for voice VLAN, the phone powers on but cannot register with the call manager. The switch port is set to trunk mode. Which protocol is essential for the phone to obtain its VLAN assignment?

A user reports that their email client can receive messages but cannot send any. The email server settings are correct, and the user can connect to the internet. The firewall is blocking outbound traffic on certain ports. Which protocol and port combination is likely blocked?

A technician is setting up a new file server and needs to ensure that users can access shared folders using a friendly name like \\fileserver\share instead of an IP address. Which protocol must be configured correctly on the network?

A network administrator configures a router to use OSPF for dynamic routing between two branch offices. After configuration, routes from one office are not appearing in the other's routing table. Both offices can ping each other's directly connected interfaces. Which protocol issue is most likely preventing route exchange?

A company deploys a new web server and wants to ensure that data transmitted between clients and the server is encrypted. The technician configures the server to use a certificate. Which protocol should be enabled on the server?

A company's remote employees use VPN to connect to the office network. Recently, some users report that they can connect to the VPN but cannot browse the internet or access internal servers by name, though they can ping internal IP addresses. The VPN is configured to push DNS settings. Which protocol is likely misconfigured on the VPN server?

A user complains that they can browse the internet but cannot access network shares on a file server by hostname, though they can access them by IP address. The DNS server is responding to queries for other domains. Which protocol is most likely malfunctioning?

A technician is troubleshooting a network where users can access internal resources but cannot reach any external websites. The internal network uses a proxy server. The technician finds that the proxy server is configured to use a specific protocol to forward requests to the internet. Which protocol is the proxy server most likely using to communicate with external web servers?

A company's web server is accessible from the internet, but users report that they cannot upload files to it using a web browser. The server is configured to allow file uploads via HTTP. Which protocol is most likely being blocked by the firewall?

A customer reports that their new VoIP phone cannot register with the company's call server, but their computer on the same switch port works fine. The network uses VLANs for voice and data traffic. Which protocol must be configured on the switch port to separate the voice traffic from the data traffic?

A technician is troubleshooting a network where users intermittently lose connectivity to a critical database server. The technician notices that the server's IP address is being duplicated on the network. Which protocol is responsible for detecting and reporting this conflict?

A small office uses a network printer that is shared via a print server. Users report that print jobs are not reaching the printer. The technician pings the print server successfully but cannot connect to the printer's web interface using its IP address. Which protocol is most likely blocked or malfunctioning?

A technician is troubleshooting a VoIP phone that cannot register with the call server. The phone has a valid IP address and can ping the call server by IP. Which protocol is most likely not functioning correctly?

A customer reports that their new all-in-one printer can scan and copy locally, but they cannot send scanned documents to their email address. The printer is connected to the office network and can ping other devices. Which protocol is most likely misconfigured on the printer?

A small office has a single public IP address and uses a router to provide internet access to 20 devices. Users report that some websites load slowly or time out, while others work fine. The router's NAT table shows many entries. Which protocol is most likely being exhausted, causing these intermittent issues?

A customer reports that their new laptop cannot connect to the internet at a coffee shop, but their smartphone works fine. The technician checks the laptop's network settings and sees the Wi-Fi adapter is enabled and connected to the correct SSID. Which protocol is most likely not configured correctly on the laptop?

A technician is setting up a new file server that needs to be accessible to employees both from the local network and remotely over the internet. The server will host shared folders. Which protocol should the technician ensure is properly configured and secured on the server for file access?

A user reports that their email client cannot send messages but can receive them. The technician verifies that the email server is reachable and that the user's credentials are correct. Which protocol is most likely misconfigured in the email client?

A technician is configuring a network printer for secure printing using IPsec. After enabling IPsec on the printer and the print server, print jobs fail to reach the printer. The technician can ping the printer from the server. Which protocol negotiation step is most likely failing?

A user reports that they can send emails but cannot receive any. The email client is configured with SMTP for outgoing and POP3 for incoming. The server is reachable. Which port is most likely blocked on the firewall for the incoming mail protocol?

A technician is configuring a new email server for a small business. Employees need to send and receive email from their desktop clients (Outlook) and also access email via a web browser. Which combination of protocols should the technician configure on the server to support both client types?