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CompTIA A+ Core 1 — Practice Exam

2.0 Networking: practice questions

Our CompTIA A+ Core 1 bank has 66 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

Which ports does SNMP use?

  1. 20 and 21
  2. 137 and 139
  3. 67 and 68
  4. 161 and 162
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D. 161 and 162 — Port 162 receives SNMP traps.

Question 2

Which port does SFTP (SSH File Transfer Protocol) use?

  1. 21
  2. 22
  3. 443
  4. 989
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B. 22 — SFTP runs over SSH.

Question 3

What does DHCP provide to clients?

  1. Email services
  2. An IP address, subnet mask, default gateway and DNS server addresses
  3. Domain names only
  4. Web pages
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B. An IP address, subnet mask, default gateway and DNS server addresses — Addresses are leased for a set time.

Question 4

Which port does DNS use?

  1. 53
  2. 67
  3. 80
  4. 389
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A. 53 — DNS uses UDP 53 for most queries and TCP 53 for zone transfers.

Question 5

Which DNS record maps a hostname to an IPv4 address?

  1. MX record
  2. AAAA record
  3. TXT record
  4. A record
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D. A record — AAAA maps to IPv6; MX identifies mail servers.

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