220-1201 Practice Test 15 — 15 Questions

Question 1

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?

Accepted Answer

802.1Q. This question tests knowledge of VLAN tagging protocols used to separate voice and data traffic on a single switch port. IEEE 802.1Q is the standard VLAN tagging protocol that allows multiple VLANs to share the same physical link, which is essential for VoIP deployments where a phone and PC share a port.

Answer

DHCP

Answer

DNS

Answer

ARP

Question 2

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?

Accepted Answer

DNS. This scenario isolates a DNS failure: local IP communication works, but name resolution fails. DNS translates domain names to IP addresses, so if it fails, web browsing by name will not work while local IP pings succeed.

Answer

DHCP

Answer

HTTP

Answer

ICMP

Question 3

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?

Accepted Answer

DHCP. This question tests the fundamental role of DHCP in automatic IP address assignment. DHCP (Dynamic Host Configuration Protocol) is the standard protocol for dynamically assigning IP addresses, subnet masks, default gateways, and other network parameters to clients.

Answer

DNS

Answer

HTTP

Answer

FTP

Question 4

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?

Accepted Answer

HTTP. This scenario tests understanding of HTTP vs HTTPS and common firewall rules. HTTP uses port 80 for web traffic, and if uploads are failing while the server is reachable, the issue may be that the firewall is blocking HTTP traffic while allowing HTTPS (port 443) or vice versa.

Answer

HTTPS

Answer

FTP

Answer

SMTP

Question 5

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?

Accepted Answer

SMTP, POP3, and HTTP. This question tests knowledge of email protocols: SMTP for sending, POP3/IMAP for receiving, and HTTP/HTTPS for webmail. The correct combination is SMTP (for sending from clients) and either POP3 or IMAP (for receiving), plus HTTP/HTTPS for web access.

Answer

FTP, SMTP, and DNS

Answer

IMAP, SNMP, and HTTPS

Answer

DHCP, SMTP, and POP3

Question 6

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?

Accepted Answer

SNMP. This scenario tests knowledge of SNMP (Simple Network Management Protocol), which is used to monitor and manage network devices. SNMP agents on devices send data to a management system; if not configured, the device won't report.

Answer

SSH

Answer

HTTP

Answer

ICMP

Question 7

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?

Accepted Answer

Port 110. This question tests knowledge of default ports: POP3 uses port 110 (or 995 for SSL). If sending works (SMTP on port 25/587) but receiving fails, the firewall likely blocks port 110 (POP3) or 995.

Answer

Port 25

Answer

Port 443

Answer

Port 53

Question 8

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?

Accepted Answer

HTTP. This question tests understanding of proxy servers and HTTP/HTTPS forwarding. A proxy server typically uses HTTP or HTTPS to forward client requests to external web servers, acting as an intermediary. The scenario implies the proxy is working internally but failing externally, pointing to the protocol used for external communication.

Answer

FTP

Answer

DNS

Answer

SNMP

Question 9

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?

Accepted Answer

DNS. This scenario isolates a DNS issue within a VPN connection. If users can ping internal IPs but not resolve names, the VPN server's DNS configuration (likely using DHCP over VPN or DNS forwarding) is failing. The protocol involved is DNS, which the VPN should push to clients.

Answer

DHCP

Answer

IPsec

Answer

SSL/TLS

Question 10

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?

Accepted Answer

SMB. This question tests knowledge of file sharing protocols. SMB (Server Message Block) is the standard protocol for Windows file sharing, used both locally and over VPN/internet (with proper security). NFS is for Unix/Linux, FTP is less secure, and HTTP is for web files.

Answer

FTP

Answer

NFS

Answer

HTTP

Question 11

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?

Accepted Answer

SMTP. The scenario describes a printer that can perform local functions but fails to send scanned documents via email, which typically uses SMTP (Simple Mail Transfer Protocol) for outgoing mail. Since the printer can ping other devices, basic network connectivity is working, pointing to a higher-layer protocol issue. SMTP is the standard protocol for sending email, so its misconfiguration would prevent email delivery.

Answer

FTP

Answer

IMAP

Answer

SNMP

Question 12

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?

Accepted Answer

NetBIOS. The ability to access shares by IP address but not by hostname indicates a name resolution problem. Since DNS works for other domains, the issue is likely with NetBIOS name resolution, which is used in Windows networks to resolve computer names to IP addresses. NetBIOS over TCP/IP (NBT) or LLMNR could be failing, but NetBIOS is the traditional protocol for this in local networks.

Answer

HTTP

Answer

DHCP

Answer

ARP

Question 13

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?

Accepted Answer

CDP. VoIP phones often use CDP (Cisco Discovery Protocol) or LLDP (Link Layer Discovery Protocol) to receive voice VLAN information from a switch. In this scenario, the switch port is in trunk mode, but without CDP/LLDP, the phone won't know which VLAN to use for voice traffic. CDP is Cisco-proprietary and commonly used in such environments to dynamically assign the voice VLAN.

Answer

STP

Answer

RSTP

Answer

VTP

Question 14

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?

Accepted Answer

NAT. NAT (Network Address Translation) uses a translation table to map private IPs to a public IP. If the table fills up due to many simultaneous connections, new connections may fail or time out. This is a common issue in small offices with limited NAT resources, leading to intermittent access problems.

Answer

DNS

Answer

DHCP

Answer

ICMP

Question 15

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?

Accepted Answer

TCP 443. HTTPS uses TCP port 443 by default. For external users to access the web server, the firewall must forward incoming traffic on port 443 to the server's internal IP address. Internal access works because it doesn't go through the firewall's external interface, so the issue is likely a missing or incorrect port forward for port 443.

Answer

TCP 80

Answer

UDP 443

Answer

TCP 3389