The Bits and Bytes of Computer
Networking. Week 4: Network Services
Already Passed
What transport layer protocol does DNS normally use? ✔✔UDP; While DNS over TCP does
exist, UDP is the most common protocol.
A DNS TTL determines what? ✔✔How long a DNS entry is allowed to be cached; TTL stands
for Time to Live and determines how long a DNS entry can be cached
How many root servers are there? ✔✔13; There are 13 root servers.
An A Record contains what? ✔✔IPv4 address; An A record contains an IPv4 address
Select all that are true. ✔✔One domain name can point to one IP; This is a valid DNS setup
One domain name can point to many IPs; this is a valid DNS setup.
Many domain names can point to the same IP; This is a valid DNS setup.
, MX stands for ________. ✔✔Mail exchange; An MX record stores a mail server's IP.
A fully qualified domain name can contain how many characters? ✔✔255; An FQDN is limited
to a total length of 255 characters.
What are the four things that all computers need configured in order to operate on a modern
network? Check all that apply. ✔✔An IP address; All computers need these four things
configured in order to operate on a modern computer network.
a name server; Computers need a name server in order to operate on a network.
a subnet mask; All computers need these four things configured in order to operate on a modern
computer network.
a default gateway; All computers need these four things configured in order to operate on a
modern computer network.
Networking. Week 4: Network Services
Already Passed
What transport layer protocol does DNS normally use? ✔✔UDP; While DNS over TCP does
exist, UDP is the most common protocol.
A DNS TTL determines what? ✔✔How long a DNS entry is allowed to be cached; TTL stands
for Time to Live and determines how long a DNS entry can be cached
How many root servers are there? ✔✔13; There are 13 root servers.
An A Record contains what? ✔✔IPv4 address; An A record contains an IPv4 address
Select all that are true. ✔✔One domain name can point to one IP; This is a valid DNS setup
One domain name can point to many IPs; this is a valid DNS setup.
Many domain names can point to the same IP; This is a valid DNS setup.
, MX stands for ________. ✔✔Mail exchange; An MX record stores a mail server's IP.
A fully qualified domain name can contain how many characters? ✔✔255; An FQDN is limited
to a total length of 255 characters.
What are the four things that all computers need configured in order to operate on a modern
network? Check all that apply. ✔✔An IP address; All computers need these four things
configured in order to operate on a modern computer network.
a name server; Computers need a name server in order to operate on a network.
a subnet mask; All computers need these four things configured in order to operate on a modern
computer network.
a default gateway; All computers need these four things configured in order to operate on a
modern computer network.
