Network Concepts

It is a conceptual framework that describes networking or telecommunications systems as seven layers, each with its own function. This help network professionals visualize what is going on within their networks and can help network managers narrow down problems

• ISO

• OSI

• Internet Protocol

• Network

How many layers does the OSI model have?

• 7

• 6

• 5

• 4

Also called "The Routing Layer". It is responsible for packet forwarding including routing through intermediate router.

• Data link

• Network Layer

• Session Layer

• Transport Layer

Give the IP address range for APIPA.

Loopback address

• 172.0.0.1

• 169.254.0.1

• 127.0.0.1

• 172.16.0.1

TCP is considered to be more reliable than UDP. True or False?

• TRUE

• FALSE

SMTP server is a computer or an application responsible for sending emails.What is the port number used by SMTP?

It is a resource record that resolves domain name/ hostname to IP address.

• A record

• CNAME record

• PTR record

• MX record

A recursive DNS lookup is where one DNS server communicates with several other DNS servers to hunt down an IP address and return it to the client.

The iterative DNS lookup doesn’t require name resolution as any DNS server can provide the name resolution if known or respond with a referral to the server with name resolution known.

Question: What type of query the resolver server used when it tries to query from the TLD server.

Protocol Data unit used Network Layer

• Packets

• Bits

• Frame