220-1201 Practice Test 21 — 15 Questions

Question 1

A customer reports that their laptop can connect to the internet via a wired connection but cannot access any network shares or printers by hostname. They can ping the IP address of the file server. Which network service is most likely misconfigured?

Accepted Answer

DNS. This scenario describes a failure in name resolution for local network resources. DNS translates hostnames to IP addresses; since the customer can ping by IP but not by name, the DNS service is the likely culprit. DHCP provides IP configuration, not name resolution, and ARP resolves IP to MAC addresses.

Answer

DHCP

Answer

NAT

Answer

ARP

Question 2

A small office has a single internet connection and needs to allow multiple internal devices to share that connection. The router's public IP is assigned by the ISP. Which network service must be enabled on the router to allow internal devices to communicate with external servers?

Accepted Answer

NAT. NAT (Network Address Translation) allows multiple devices on a private network to share a single public IP address by translating their private IPs to the public IP. DHCP assigns internal IPs but does not enable internet sharing. DNS resolves names, and PAT is a form of NAT but not the broad service name.

Answer

DHCP

Answer

DNS

Answer

PAT

Question 3

A user complains that they cannot access any websites, but they can ping external IP addresses like 8.8.8.8 successfully. Other devices on the same network work fine. Which network service is most likely failing on this user's computer?

Accepted Answer

DNS. The user can ping by IP but not access websites, indicating that name resolution is failing. DNS translates domain names to IP addresses; since other devices work, the issue is likely local to the user's DNS configuration. DHCP and NAT are network-wide and would affect all devices.

Answer

DHCP

Answer

NAT

Answer

Proxy

Question 4

A technician is configuring a new file server and wants to ensure that when users type \fileserver in File Explorer, it resolves to the correct IP address. The network uses a Windows domain with Active Directory. Which network service should the technician configure to allow hostname resolution for this server?

Accepted Answer

DNS. In a Windows domain, DNS is the primary method for resolving hostnames to IP addresses, especially for servers. The technician should add an A record for the file server in the DNS zone. DHCP assigns IPs but does not provide name resolution, and WINS is legacy for NetBIOS names.

Answer

DHCP

Answer

WINS

Answer

NAT

Question 5

A company's web server is hosted internally and must be accessible from the internet using the domain name www.company.com. The public IP address of the router is 203.0.113.5. Which two network services must be correctly configured to make this work?

Accepted Answer

DNS and NAT. DNS must resolve the domain name to the public IP, and NAT (specifically port forwarding) must translate that public IP to the internal web server's private IP. DHCP and ARP are not directly involved in internet-facing access.

Answer

DNS and DHCP

Answer

NAT and ARP

Answer

DHCP and NAT

Question 6

A user reports that their computer cannot connect to the internet after being moved to a new office. The computer receives an IP address starting with 169.254.x.x. Which network service is failing to provide a valid IP configuration?

Accepted Answer

DHCP. An IP address in the 169.254.x.x range indicates that the computer has assigned itself an Automatic Private IP Address (APIPA) because it did not receive a response from a DHCP server. The DHCP service is failing or unreachable. DNS and NAT are not involved in IP assignment.

Answer

DNS

Answer

NAT

Answer

ARP

Question 7

A technician is troubleshooting a network where users can access the internet but cannot connect to a specific internal application server by its hostname. Pinging the server's IP address works. The DNS server is configured correctly for external names. What is the most likely cause?

Accepted Answer

The DNS server does not have an A record for the application server. The DNS server resolves external names but not the internal hostname, indicating a missing or incorrect DNS record (A or CNAME) for the internal server. DHCP is not involved, and NAT is working since internet access is fine. A proxy server could interfere but is less likely than a missing DNS record.

Answer

The DHCP server is out of IP addresses

Answer

NAT is misconfigured for the internal network

Answer

The proxy server is blocking the hostname

Question 8

A network administrator is setting up a new branch office. The branch router must automatically obtain a public IP address from the ISP, and internal devices must receive private IP addresses from the router. Which combination of network services should be configured on the router?

Accepted Answer

DHCP client and DHCP server. The router needs DHCP client mode to obtain a public IP from the ISP, and DHCP server mode to assign private IPs to internal devices. DNS and NAT are also needed but the question asks for the services that provide IP addresses. NAT is required to translate private IPs to the public IP for internet access.

Answer

DHCP client and DNS server

Answer

DHCP server and NAT

Answer

DNS server and NAT

Question 9

A technician is troubleshooting an issue where a user's computer can access the internet but cannot connect to a network printer by its IP address. The printer is on the same subnet and is powered on. Pinging the printer's IP from the computer fails. Which network service is most likely causing the problem?

Accepted Answer

ARP. Since the printer is on the same subnet, no routing is needed; ARP is required to resolve the printer's IP to its MAC address. If ARP fails, the ping will fail. DNS is not used when connecting by IP, and DHCP is not involved since the computer already has an IP.

Answer

DNS

Answer

DHCP

Answer

NAT

Question 10

A company uses a proxy server for internet access. Users report that they can access internal websites but cannot reach external sites. The proxy server's IP is configured in the browser settings. Which network service is most likely failing?

Accepted Answer

Proxy server. The proxy server acts as an intermediary for external requests. If users can reach internal sites (which bypass the proxy) but not external ones, the proxy server itself or its connection to the internet is failing. DNS and DHCP are likely working since internal access is fine.

Answer

DNS

Answer

DHCP

Answer

NAT

Question 11

A small business reports that employees can access the internet but cannot reach the internal company website hosted on a local server. The server's IP address is 192.168.1.10, and clients use DHCP. What is the most likely cause?

Accepted Answer

The DNS server lacks a host record for the internal website.. This question tests understanding of DNS resolution for internal resources. When a server hosts an internal website, clients need a DNS record (often a host record) to resolve its hostname to the private IP address. Without it, clients can't reach the site by name even with internet access.

Answer

The DHCP server is not assigning the correct subnet mask.

Answer

The switch port connecting the server is administratively down.

Answer

The firewall is blocking port 443 inbound.

Question 12

A user complains that their laptop cannot connect to the company's wireless network, but other devices work fine. The network uses WPA2-Enterprise with 802.1X authentication. Which service is most likely misconfigured on the laptop?

Accepted Answer

The 802.1X authentication method is set to PEAP instead of EAP-TLS.. This question tests knowledge of enterprise wireless authentication. WPA2-Enterprise uses RADIUS for centralized authentication. If the laptop's 802.1X settings are wrong, it will fail authentication even though the network is operational.

Answer

The DHCP server is out of addresses.

Answer

The DNS server address is incorrect.

Answer

The RADIUS server is offline.

Question 13

A technician is setting up a new file server and wants to ensure that clients can automatically obtain the server's IP address via a friendly name without manual configuration. Which network service should be configured on the server?

Accepted Answer

DNS. This question tests basic understanding of DNS. DNS resolves hostnames to IP addresses, allowing clients to use a friendly name like 'fileserver' instead of an IP. DHCP assigns IPs, but DNS provides name resolution.

Answer

DHCP

Answer

RADIUS

Answer

NTP

Question 14

A company uses a cloud-based VoIP service, and users report intermittent call drops and poor audio quality. Network monitoring shows high jitter and packet loss. Which service is most likely contributing to the problem?

Accepted Answer

The network is not prioritizing VoIP traffic via QoS.. This question tests understanding of network services affecting real-time traffic. SIP is the signaling protocol for VoIP, but jitter and packet loss are typically caused by network congestion or QoS misconfiguration. DHCP, DNS, or RADIUS don't directly cause these symptoms.

Answer

The DHCP server is leasing IP addresses with a short lease time.

Answer

The DNS server is responding slowly to queries.

Answer

The SIP server is overloaded with registration requests.

Question 15

A technician needs to configure a router to allow internal users to access a web server on the internet using a public IP address. The web server is hosted internally on a private IP. Which network service must be configured on the router?

Accepted Answer

NAT. This question tests knowledge of NAT. Network Address Translation (NAT) translates private IPs to public IPs and vice versa, enabling internal servers to be reachable from the internet. DNS resolves names, but NAT handles the IP translation.

Answer

DNS

Answer

DHCP

Answer

RADIUS