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Internet Protocols & Network Foundations Flashcards

7 cards from real CIW practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Internet Protocols & Network Foundations flashcards as text

  1. Which DNS record type maps a hostname to an IPv4 address?

    Answer: A

    An A (Address) record directly maps a domain name to a 32-bit IPv4 address.

  2. What is the default port used by SMTP for email submission?

    Answer: 25

    SMTP uses port 25 as its well-known port for server-to-server mail transfer and traditional mail submission.

  3. What is the key functional difference between POP3 and IMAP email protocols?

    Answer: IMAP keeps messages on the server and syncs state; POP3 downloads and typically deletes them locally

    IMAP synchronizes messages across multiple devices while leaving them on the server; POP3 downloads messages to one client and usually removes them from the server.

  4. Which DNS record type specifies the authoritative mail servers for a domain?

    Answer: MX

    An MX (Mail Exchanger) record identifies the mail servers responsible for accepting email on behalf of a domain.

  5. What is a DNS TTL (Time to Live) value used for?

    Answer: The duration a DNS record can be cached by resolvers before being refreshed

    TTL tells caching resolvers how many seconds to store a DNS record before querying the authoritative server again for a fresh copy.

  6. FTP uses two separate ports — what are they and what does each do?

    Answer: Port 20 for data transfer, port 21 for control commands

    FTP uses port 21 for the control connection (commands) and port 20 for the actual data transfer in active mode.

  7. Which DNS record type creates an alias from one hostname to another canonical hostname?

    Answer: CNAME

    A CNAME (Canonical Name) record maps an alias domain name to the true (canonical) domain name, which is then resolved normally.

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