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IC3 - Lesson 13: Looking at the Internet with complete solutions graded A+
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IC3 - Lesson 13: Looking at the Internet with complete solutions graded A+
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IC3 - Lesson 13: Looking at the InternetWhat is a "network"? What is the "internet"? - correct answer ✔✔A NETWORK is two or more
computers connected together. The INTERNET is made of many smaller networks which are connected
together so that they can communicate and share information.
What is the "backbone" of the internet? - correct answer ✔✔The BACKBONE of the internet is a series of
redundant, high-speed networks that are owned and operated by some of the largest long-distance
voice carriers, such as AT&T, Verizon, Sprint, etc.
(redundant = parts that duplicate each other so that if one part fails, there is always a backup available)
What is a "Tier 1 provider"? - correct answer ✔✔Companies that operate networks on the backbone are
called TIER 1 PROVIDERS.
What is an "IXP"? What does it do? - correct answer ✔✔An IXP is an INTERNET EXCHANGE POINT. It is
located on the backbone and is a point at which the Tier 1 provider networks connect with each other.
High speed routers keep network traffic moving.
What is an "ISP"? How do ISPs get internet access? - correct answer ✔✔An ISP is an INTERNET SERVICE
PROVIDER, such as a cable or phone company. Local ISPs negotiate with Tier 1 providers for internet
access. Individual consumers and businesses buy their internet service from a local ISP.
What are the physical parts of the internet? - correct answer ✔✔Physically, the internet is a collection of
hardware including cables, routers, switches, microwave links, servers and communication protocols.
What is a "packet"? What does a packet contain? - correct answer ✔✔A PACKET is a package of
information. It contains the address information for both the device that is sending the information and
the device that is receiving it. All data that is sent over a network is broken down into packets (the
process of PACKETIZATION) before it is transmitted across the network.
What is a "data payload"? - correct answer ✔✔In addition to the addresses, the packet also contains a
DATA PAYLOAD, which is the actual information that is being sent from one device to the other.
, What is the function of routers on the internet? - correct answer ✔✔Each router along the internet
reads the address information and forwards the packet to another router. The packet travel along
interconnecting networks until it reaches the network where the receiving device is located. Routers also
determine the best path for a transmission to take and pass that transmission on to the next router on
the path.
What happens to the packets when they reach their destination? - correct answer ✔✔At the destination,
the packets are reassembled into the original data transmission.
Who owns the internet? - correct answer ✔✔It is not owned by anyone. It is a public network and can
be used by anyone with a valid IP address and an internet connection.
What is a good thing about a public network? What is a bad thing about a public network? - correct
answer ✔✔A good thing about a public network is that any computer can exchange email, data, and
programs with any other computer.
One bad thing about the internet is that computers can exchange malware and computers are
vulnerable to unwanted activity such as theft of personal information or eavesdropping (secretly
listening to what other people are saying).
What is a private network? What do you need to access a private network? - correct answer ✔✔A
private network is one run by an individual, a school, an organization, or a company where you need a
user name and password to get on the network and there are protections against unwanted access.
What is an "intranet"? What is it used for? - correct answer ✔✔An INTRANET or INTERNAL WEBSITE is a
private network for a corporation or organization that only those with permission can access. An intranet
allows employees, partners or students to access private LAN resources from outside the LAN. An
intranet is similar to a VPN (Virtual Private Network).
What are the two network connection types? What is the difference? What do they allow, or not allow,
you to do? - correct answer ✔✔There are PRIVATE and PUBLIC types of connections.
If you set up a PRIVATE CONNECTION, then your device will identify other computers, devices and
content on the network. Your device also becomes discoverable by other computers on the network.
If you set up a PUBLIC CONNECTION, Windows will not allow your PC to be discovered by other
computers on the network and sharing will be disabled.
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