What transport layer protocol does DNS normally use?
answer
UDP; While DNS over TCP does exist, UDP is the most common protocol.
question
A DNS TTL determines what?
answer
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
question
How many root servers are there?
answer
13; There are 13 root servers.
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An A Record contains what?
answer
IPv4 address; An A record contains an IPv4 address
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Select all that are true.
answer
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.
question
MX stands for ________.
answer
Mail exchange; An MX record stores a mail server's IP.
question
A fully qualified domain name can contain how many characters?
answer
255; An FQDN is limited to a total length of 255 characters.
question
What are the four things that all computers need configured in order to operate on a modern network? Check all that apply.
answer
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.
question
When using Fixed Allocation DHCP, what's used to determine a computer's IP?
answer
a MAC address; Fixed Allocation DHCP ensures that computers receive an IP address reserved for it via its MAC address.
question
The process by which a client configured to use DHCP attempts to get network configuration information is known as _________________.
answer
DHCP Discovery; DHCP Discovery is how a client determines configuration information.
question
NAT addresses concerns over the dwindling IPv4 address space by ___________________.
answer
allowing computers using non-routable address space to communicate with the Internet; NAT allows networks to use non-routable address space for their internal devices.
question
What technique allows for inbound traffic through a NAT?
answer
Port forwarding ; Port forwarding is a technique that allows for inbound traffic through a router configured to NAT.
question
The total number of IPv4 addresses is approximately:
answer
4.2 billion; There are approximately 4.2 billion IPv4 addresses.
a method where you need more than a username and a password; Two-factor authentication requires a username/password and something extra
question
VPNs are known as a _____ protocol.
answer
tunneling; VPNs are tunneling protocols.
question
A proxy is something that _______________________.
answer
communicates on behalf of something else; While proxies are many things, they primarily communicate on behalf of something else.
question
A technique that's used to route traffic to different destinations, depending on factors like location, congestion, or link health, is known as _____.
answer
anycast; Anycast lets you route traffic depending on many factors.
question
A concept that involves iterating over a list of items one by one in an orderly fashion is known as _______.
answer
Round robin; Round robin ensures a fairly equal distribution across its members.
question
Administration and definition of TLDs are handled by a non-profit organization known as _______.
answer
ICANN is responsible for maintaining the global domain name system.
question
When a range of IP addresses is set aside for client devices, and one of these IPs is issued to these devices when they request one, this is known as _______ allocation.
answer
dynamic; Dynamic Allocation DHCP will assign a random IP from a pool of IPs to a device that needs one.
question
VPN stands for _______
answer
Virtual Private Network; A VPN allows a device to establish an encrypted tunnel to another network.
question
A company moves a popular website to a new web host. Which of the following will change as a result?
answer
Internet Protocol address; The IP address will certainly change. However, with DNS in place the name stays the same and users will never know that the website moved.
question
The "www" portion of a domain is known by which of the given options? Check all that apply.
Top Level Domain (TLD) name
subdomain
Host name
Fully Qualified Domain Name (FQDN)
answer
subdomain; A subdomain like "www" precedes the domain name and is used to further identify a system and its purpose.
You didn't select all the correct answers
question
Which of the following allows computers on a network to automatically receive address assignment information?
answer
Dynamic Host Protocol; DHCP is used to automatically assign IP addresses to devices on a network.
question
Network Address Translation (NAT) technology provides a major benefit for which of these network problems?
Port Preservation, Address exhaustion, Assigning Internet Protocol address blocks, Routable addresses
answer
Routable address; Incorrect
Not quite. Please review the videos in the "Network Address Translation" module for a refresher.
question
Which technology uses a tunneling protocol?
answer
Virtual Private Network; A VPN uses a tunnel to maintain private and secure communications.
question
What port on a name server is used for User Datagram Protocol (UDP) name request packets?
answer
53; DNS uses port 53 over UDP for name resolution communications.
question
A complete Fully Qualified Domain Name (FQDN) is limited to how many characters?
answer
255; A complete FQDN can be up to 255 characters.
question
Which of the following is NOT configured by a Dynamic Host Protocol (DHCP) server?
answer
Media Access Control address; A MAC address is a hardware address assigned to a device by the manufacturer.
question
A Virtual Private Network (VPN) uses a particular layer from the OSI reference model to carry an encrypted payload that actually contains an entire second set of packets. Which layer is used?
answer
Transport; The payload section of the transport layer is used to contain an entire second set of packets.
question
What service acts on behalf of a client in order to access another service?
answer
Proxy Server; Proxies sit between clients and other servers to facilitate connections.
question
During the name resolution process, which technique is used to avoid congestion when querying a server?
answer
Anycast; Anycast allows a request to be sent to an appropriate server based on factors, like location. This helps relieve severe congestion.
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