Question Q-5463 An ___ address is a private IP address automatically assigned…
3 comments · last active May 10, 2026
CompTIA A+ - Networking and Connectivity
By Jordan Blake · Updated Jun 3, 2026
| Questions | 19 |
| Passing Score | 75% |
| Format | 53% Multiple Choice |
| Sessions Logged | 710 |
| Your progress | Log in / Register to track times taken, best score, questions mastered, and coverage on this quiz. |
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Class C default mask /24 = 255.255.255.0 — they still test legacy classful stuff even though CIDR is what we use in the field.
Class A /8 and B /16 still fair game on objectives. Don't skip the basics.
DORA for DHCP — Discover Offer Request Ack. Easy mnemonic, shows up all the time.
And if DHCP fails you get APIPA — ties back to Q9 on this quiz.
Hub vs switch tripped me up at first — key is collision domain. Hub = one big collision domain, switch = per-port. Messer drills this hard.
+2 votesYep. And hubs are basically museum pieces now. If you see one on the exam it's testing that broadcast-to-all-ports behavior.
Matching hub/switch/router/repeater — draw the OSI layers. Repeater and hub L1, switch L2, router L3.
Took me two tries. Read the table carefully — they swap functions sometimes in distractors.
Wireless troubleshooting order: check physical switch → SSID/password → ipconfig → ping gateway → ping 8.8.8.8 → DNS. This quiz covers the ipconfig part well.
Don't forget APIPA in the chain — if you skip straight to 'reboot router' you miss DHCP failures.
Loopback is 127.0.0.1 / ::1 — NOT 255.255.255.255. I almost picked broadcast on a practice test because I rushed.
+2 votes255.255.255.255 is limited broadcast on the local segment. Loopback never hits the wire — ping 127.0.0.1 tests your own stack.
+1 votesIf ping 127.0.0.1 fails, you're looking at a broken NIC driver or stack, not cable issues.
Port forwarding maps external port on the router to an internal host — common for game servers or accessing a cam from outside. Don't confuse with PAT/overload.
NAT/PAT is many private IPs sharing one public. Port forward is 'when traffic hits WAN port X, send to 192.168.1.50:port Y'.
80 and 443 — write them on a sticky note. HTTP/HTTPS show up constantly on A+ and Net+.
Throw in DNS 53 and DHCP 67/68 while you're at it. Port questions are free points if you drill them.
NAT lets a whole home network share one public IP. PAT uses different source ports to track sessions — that's the overload part.
True on the quiz — NAT conserves IPv4. IPv6 was partly about not needing NAT everywhere.
Question catalog for this preview
Catalog listing of the 5 preview questions for this quiz.
Question 1
?? Multiple Choice (Hard)
A user receives an IP address of 169.254.100.5. What does this indicate, and how do you fix it?
Explanation
169.254.x.x is the APIPA range — a Windows fallback when no DHCP server responds. Troubleshooting steps: 1) Check physical cable/Wi-Fi connection; 2) ipconfig /release, ipconfig /renew; 3) Verify DHCP server is running; 4) Check scope has available addresses; 5) Check DHCP helper address if on different VLAN; 6) Verify firewall isn't blocking UDP 67/68.
Question 2
?? Fill in the Blank (Hard)
The DNS record type [[blank1]] maps a domain name to an IPv4 address, while [[blank2]] maps a domain name to an IPv6 address.
Explanation
DNS record types: A (IPv4 address), AAAA (IPv6 address), CNAME (alias to another name), MX (mail exchange server), TXT (text data — SPF, DKIM, domain verification), NS (name server), PTR (reverse DNS — IP to name), SOA (Start of Authority). Mail servers use MX records.
Question 3
?? True/False (Easy)
A MAC address is a physical address permanently assigned to a network interface card (NIC).
Explanation
MAC (Media Access Control) addresses are 48-bit hardware addresses (e.g., 00:1A:2B:3C:4D:5E) assigned by the NIC manufacturer. The first 24 bits (OUI — Organizationally Unique Identifier) identify the manufacturer. MAC addresses operate at Layer 2 (Data Link) of the OSI model. They can be spoofed in software despite being "physical."
Question 4
?? Fill in the Blank (Hard)
A [[blank1]] is a type of wireless network that uses multiple access points to provide seamless coverage over a large area, automatically handing off clients as they move between APs.
Explanation
An ESS (Extended Service Set) uses multiple APs with the same SSID, allowing clients to roam seamlessly. Mesh networks add dynamic backhaul between nodes (no controller required). 802.11r enables fast BSS transitions. Enterprise systems (Cisco, Aruba, Meraki) use wireless LAN controllers (WLC) to manage large-scale WLAN deployments.
Question 5
?? Multiple Choice (Medium)
Which TCP/IP layer is responsible for end-to-end communication and reliable data delivery?
Explanation
The Transport Layer (Layer 4) handles end-to-end communication between processes on different hosts. TCP (connection-oriented): provides reliable, ordered, error-checked delivery with flow control and acknowledgment. UDP (connectionless): best-effort, no guaranteed delivery — faster, used for DNS, streaming, gaming. Ports operate at Layer 4.
APIPA 169.254.x.x — if you see that on a workstation, DHCP is broken or unreachable. First thing I check on 'can't get online' tickets.
Learned that the hard way in a lab. ipconfig showed 169.254 and I spent 20 min chasing DNS before realizing no lease.
Same. Link-local still pings neighbor on subnet though — useful for troubleshooting.