Question Q-5523 A technician wants to see all current TCP connections and…
2 comments · last active Jun 5, 2026
CompTIA A+ Core 1 220-1201 - Domain 2 Networking
By Jordan Blake · Updated May 25, 2026
| Questions | 25 |
| Passing Score | 75% |
| Format | 100% Multiple Choice |
| Sessions Logged | 650 |
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No DHCP lease → APIPA 169.254.x.x. Check scope exhausted, wrong VLAN, or rogue DHCP server.
ipconfig /release /renew is first practical step after confirming NIC link light.
Ping gateway OK but no internet = often DNS. Ping 8.8.8.8 vs ping google.com to split L3 vs name resolution.
If IP works and name doesn't, flush DNS cache (ipconfig /flushdns) and check DHCP DNS servers handed out.
APIPA range 169.254.0.0–169.254.255.255 — link-local, machines can talk on segment without DHCP.
Same concept as the standalone A+ networking quiz Q9 if anyone cross-studying old material.
DNS translates FQDN to IP. Hosts file overrides for testing — malware abuses it for redirects.
nslookup vs dig — Windows techs live in nslookup; know record types A vs AAAA vs CNAME basics.
Subnetting on A+ = why networks exist, broadcast domains, efficient IP use — not full CCNA math every time.
/24 = 254 usable hosts, /25 = 126, etc. Practice writing mask from CIDR for speed.
ping 127.0.0.1 = loopback tests own TCP/IP stack, not cable or switch. First isolation step in methodology.
Then ping gateway, then remote IP, then hostname — CompTIA loves that order.
WPA3-Personal = SAE resists offline dictionary attacks better than WPA2-PSK. Enterprise uses 802.1X.
WEP is dead; TKIP is legacy. If answer mentions WEP on a new deployment, it's wrong.
HTTPS = 443. HTTP 80, DNS 53, DHCP 67/68 — sticky note on monitor saved me.
+2 votesRDP 3389, SSH 22, FTP 21 — they rotate through practice tests. Know TCP vs UDP for DHCP/DNS.
Question catalog for this preview
Catalog listing of the 5 preview questions for this quiz.
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?
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?
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?
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?
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?
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.
netstat shows connections/listeners; identify rogue service on weird port. -ano adds PID on Windows.
Pair with Task Manager or resource monitor to kill malicious process after spotting port.