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Fundamentals of computer networks

Fundamentals of computer networks

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Question 4

A network administrator is configuring firewall rules for a corporate local area network. Users must be able to send outgoing email messages to an external mail server and retrieve incoming email messages such that the read/unread status of messages is kept synchronised across multiple client devices (such as laptops and smartphones).

Assuming standard non-encrypted ports are used, which of the following options correctly identifies the protocols and TCP port numbers that must be permitted through the firewall?

A

Sending: SMTP on port 143143143; Retrieving/Synchronising: IMAP on port 252525

B

Sending: SMTP on port 252525; Retrieving/Synchronising: IMAP on port 143143143

C

Sending: SMTP on port 252525; Retrieving/Synchronising: POP3 on port 110110110

D

Sending: HTTPS on port 443443443; Retrieving/Synchronising: IMAP on port 143143143

Markscheme

Fundamentals of computer networks Questions

  1. GCSE
  2. /Computer Science
  3. /Fundamentals of computer networks

105 exam-style questions on AQA GCSE Computer Science Fundamentals of computer networks. Each one has a worked solution and a mark scheme showing where the marks go.

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