Sample A+ Core 1 (220-1201) — 2.0 Networking questions with explanations
Use these examples to check how the topics are tested. Read the explanation for every option you were unsure about, then start a scored practice set above.
Question 1
1.0 Mobile Devices / 2.0 Networking
Which protocol typically uses TCP/UDP port 23?
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○ SMTP
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✓ Telnet
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○ RDP
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○ LDAP
Answer:
B. Telnet
TCP port 23 is used by assigned to Telnet.. It is a well-known port reserved by IANA for this service. Security best practice recommends restricting access to this port using a firewall.
Question 2
2.0 Networking
An IT manager is designing the network layout for a new corporate campus. The design must include a high-speed, centrally managed network that interconnects all the buildings on the property, which spans an area of 2 square miles. Which network type BEST describes this design?
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○ Personal Area Network (PAN)
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○ Wide Area Network (WAN)
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✓ Metropolitan Area Network (MAN)
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○ Local Area Network (LAN)
Answer:
C. Metropolitan Area Network (MAN)
The correct answer is C, a Metropolitan Area Network (MAN). A MAN is a network that spans a city or campus, typically larger than a single building but smaller than a wide area network. A corporate campus spanning 2 square miles fits this description. A is incorrect because a PAN is for an individual's devices within a very short range (e.g., Bluetooth). B is incorrect because a WAN spans a much larger geographic area, such as connecting networks across cities or countries, often using third-party carriers. D is incorrect because a LAN is confined to a single building or group of buildings in close proximity, generally smaller than a campus of this scale.
Question 3
2.0 Networking / 5.0 Troubleshooting
A network shows "no link light". What are likely causes?
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○ Duplex mismatch, old cable, congestion
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○ Loose connection, EMI, failing NIC
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✓ Cable disconnected, faulty cable, bad port
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○ APIPA, DHCP failure, wrong subnet
Answer:
C. Cable disconnected, faulty cable, bad port
No link light: Cable disconnected, faulty cable, bad port.
Question 4
1.0 Mobile Devices / 2.0 Networking
Which protocol typically uses TCP/UDP port 3389?
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○ HTTPS
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✓ RDP
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○ HTTP
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○ SSH
Answer:
B. RDP
TCP port 3389 is used by assigned to RDP.. It is a well-known port reserved by IANA for this service. Security best practice recommends restricting access to this port using a firewall.
Question 5
2.0 Networking
A technician is reviewing the configuration of a newly deployed network printer and notices it has an IPv6 address starting with 'fe80::'. The printer is communicating successfully with other devices on the same local network segment. Which of the following BEST describes this type of address and its primary purpose?
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○ A global unicast address used for internet-routable communication
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○ A unique local address (ULA) used for private internal networks
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✓ A link-local address used for communication on a single network segment
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○ A loopback address used for internal testing on the device itself
Answer:
C. A link-local address used for communication on a single network segment
An IPv6 address beginning with 'fe80::' is a link-local address. Link-local addresses are automatically configured on an interface (using the fe80::/64 prefix) and are only valid for communication on that specific physical or logical network segment (link). They are not routable beyond the local link. Option A describes a global unicast address (typically starting with 2000::/3). Option B describes a unique local address (ULA) in the fc00::/7 range. Option D describes the loopback address ::1.
Question 6
2.0 Networking / 5.0 Troubleshooting
A network shows "intermittent connectivity". What are likely causes?
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✓ Loose connection, EMI, failing NIC
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○ APIPA, DHCP failure, wrong subnet
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○ Duplex mismatch, old cable, congestion
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○ Cable disconnected, faulty cable, bad port
Answer:
A. Loose connection, EMI, failing NIC
Intermittent connectivity: Loose connection, EMI, failing NIC.
Question 7
1.0 Mobile Devices / 2.0 Networking
Which protocol typically uses TCP/UDP port 161?
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○ LDAP
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✓ SNMP
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○ DNS
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○ IMAP
Answer:
B. SNMP
TCP port 161 is used by assigned to SNMP.. It is a well-known port reserved by IANA for this service. Security best practice recommends restricting access to this port using a firewall.
Question 8
2.0 Networking
A company has been assigned the 192.168.1.0/24 network and needs to create four subnets, each supporting at least 50 hosts. Which subnet mask should the technician use?
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○ 255.255.255.128 (/25)
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✓ 255.255.255.192 (/26)
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○ 255.255.255.224 (/27)
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○ 255.255.255.240 (/28)
Answer:
B. 255.255.255.192 (/26)
A /25 subnet provides 126 usable hosts per subnet (2^7 - 2) but only 2 subnets, not enough. A /26 subnet provides 62 usable hosts (2^6 - 2) and creates 4 subnets (2^2), meeting both requirements. /27 yields 30 hosts per subnet (insufficient), and /28 yields 14 hosts. Therefore, the correct subnet mask is 255.255.255.192 (/26).
Question 9
2.0 Networking / 5.0 Troubleshooting
Which network tool is used to verifies cable continuity and pinout?
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○ Loopback plug
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✓ Cable tester
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○ Punchdown tool
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○ Crimping tool
Answer:
B. Cable tester
Cable tester: Verifies cable continuity and pinout.
Question 10
1.0 Mobile Devices / 2.0 Networking
Which protocol typically uses TCP/UDP port 143?
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○ SSH
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○ RDP
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✓ IMAP
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○ SNMP
Answer:
C. IMAP
TCP port 143 is used by assigned to IMAP.. It is a well-known port reserved by IANA for this service. Security best practice recommends restricting access to this port using a firewall.
Question 11
2.0 Networking
Which protocol is for Voice over IP?
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○ SMTP
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○ FTP
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✓ SIP
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○ HTTP
Answer:
C. SIP
SIP is correct. This concept is important for the certification exam and appears in scenario-based questions testing your understanding of when and how to apply it.
Question 12
2.0 Networking / 5.0 Troubleshooting
Which Windows command shows active network connections?
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✓ netstat
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○ ipconfig
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○ chkdsk
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○ sfc
Answer:
A. netstat
netstat: Shows active network connections.
Question 13
1.0 Mobile Devices / 2.0 Networking
Which protocol typically uses TCP/UDP port 445?
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○ Telnet
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✓ SMB
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○ SMTP
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○ SNMP
Answer:
B. SMB
TCP port 445 is used by assigned to SMB.. It is a well-known port reserved by IANA for this service. Security best practice recommends restricting access to this port using a firewall.
Question 14
2.0 Networking
Choose 2
A network administrator needs to allow encrypted remote management of a router. Which two ports should be permitted through the firewall? (Choose TWO)
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✓ 22
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○ 23
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○ 80
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✓ 443
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○ 3389
Answer:
A. 22 | D. 443
Port 22 is used by SSH, which provides encrypted command-line access. Port 443 is used by HTTPS, enabling encrypted web-based management. Port 23 (Telnet) is unencrypted, port 80 (HTTP) is also unencrypted, and port 3389 (RDP) is encrypted but typically used for remote desktop to Windows systems, not router management. Therefore, ports 22 and 443 are the correct choices for encrypted router management.
Question 15
2.0 Networking / 5.0 Troubleshooting
Which Windows command is used to displays ip configuration?
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✓ ipconfig
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○ tracert
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○ nslookup
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○ diskpart
Answer:
A. ipconfig
ipconfig: Displays IP configuration.
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