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CompTIA A+ Core 1 220-1201 - Domain 2 Networking

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Question 1

A technician is setting up a wireless network in a warehouse with many metal shelves. Users at the far end experience poor signal. Which action would MOST improve coverage without replacing the existing AP?

Answer choices

  • A. Switch from 5 GHz to 2.4 GHz on all devices

  • B. Add a wireless range extender/repeater in the middle of the warehouse (Correct)

  • C. Increase the DHCP lease time

  • D. Switch to Cat 6 Ethernet cabling

Explanation

A wireless range extender/repeater placed in a central location can rebroadcast the Wi-Fi signal and extend coverage. Switching to 2.4 GHz improves range but reducing channel capacity. A mesh AP would be ideal, but a repeater is a practical improvement.

Question 2

Which protocol translates human-readable domain names (like www.google.com) into IP addresses?

Answer choices

  • A. DHCP

  • B. DNS (Domain Name System) (Correct)

  • C. ARP

  • D. SNMP

Explanation

DNS (Domain Name System) resolves hostnames and fully qualified domain names (FQDNs) to IP addresses. Without DNS, users would need to know IP addresses to access websites and services.

Question 3

A user is unable to resolve website names but can connect to servers using IP addresses directly. Which command should the technician run FIRST to diagnose?

Answer choices

  • A. `ping 127.0.0.1`

  • B. `nslookup google.com` (Correct)

  • C. `ipconfig /release`

  • D. `tracert 192.168.1.1`

Explanation

`nslookup` queries DNS servers directly to test name resolution. Since the user can connect by IP but not by name, the issue is clearly DNS-related. nslookup will reveal whether DNS queries are reaching the server and returning correct responses.

Question 4

A technician needs to test if a specific network port is open on a remote server. Which command-line tool can test TCP port connectivity?

Answer choices

  • A. `ipconfig`

  • B. `nslookup`

  • C. `telnet [host] [port]` or `Test-NetConnection` (PowerShell) (Correct)

  • D. `arp -a`

Explanation

`telnet [hostname] [port]` attempts a TCP connection to a specific port. If it connects, the port is open. PowerShell's `Test-NetConnection -Port` is the modern equivalent. `ipconfig` shows IP config; `nslookup` tests DNS.

Question 5

Which of the following BEST describes the purpose of subnetting?

Answer choices

  • A. Encrypting traffic between network segments

  • B. Dividing a large network into smaller, more manageable logical segments to improve performance and security (Correct)

  • C. Translating private IP addresses to public IP addresses

  • D. Resolving domain names to IP addresses

Explanation

Subnetting divides a large IP address space into smaller subnets (subnetworks), reducing broadcast domains, improving network performance, enabling better security segmentation, and more efficient IP address allocation.