CIW Internet Protocols & Network Foundations 2

Question 1

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

Accepted Answer

A

Answer

MX

Answer

CNAME

Answer

PTR

Question 2

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

Accepted Answer

25

Answer

110

Answer

143

Answer

993

Question 3

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

Accepted Answer

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

Answer

POP3 keeps messages on the server; IMAP downloads and deletes them

Answer

They are functionally identical but use different ports

Answer

POP3 is for incoming mail only; IMAP handles both incoming and outgoing mail

Question 4

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

Accepted Answer

MX

Answer

A

Answer

CNAME

Answer

NS

Question 5

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

Accepted Answer

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

Answer

The maximum size of a DNS response packet

Answer

The number of authoritative DNS servers that must store a record

Answer

The encryption strength applied to DNS query responses

Question 6

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

Accepted Answer

Port 20 for data transfer, port 21 for control commands

Answer

Port 21 for data transfer, port 22 for control commands

Answer

Port 80 for data transfer, port 21 for control commands

Answer

Port 22 for both data transfer and control commands

Question 7

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

Accepted Answer

CNAME

Answer

A

Answer

MX

Answer

TXT