Networking Devices and Initial Configuration - Module 5

What is data encapsulation in networking?

• The process of compressing data before sending it over a network
• The process of converting data into a different format for storage
• The process of encrypting data to make it secure during transmission
• The process of wrapping data in a header and/or trailer before it is transmitted over a network.

What is the network layer in OSI?

• Layer 3
• Layer 7
• Layer 2
• Layer 5

Explain the difference between the Network Layer and the Data Link Layer.

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Answer explanation

Net -> IP

DLL -> MAC

To accomplish end-to-end communications across network boundaries, network layer protocols perform four basic operations:

• Addressing end devices

• Encapsulation

• Routing

• De-encapsulation

When the network layer encapsulates the PDU further, it adds what?

• IP header

• MAC header

• Session header

• Checksum header

The IP header is examined by what type of devices?

• Printers and scanners
• Hubs and switches

• APs and bridges

• Routers and firewalls

What is NOT a characteristic of an IP?

• connectionless

• effortless

• best effort

• media independent

Explain the IP characteristic of CONNECTIONLESS

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Answer explanation

IP is connectionless, meaning that no dedicated end-to-end connection is created by IP before data is sent. Connectionless communication is conceptually similar to sending a letter to someone without notifying the recipient in advance.

IP requires no initial exchange of control information to establish an end-to-end connection before packets are forwarded.

This is known as

• best effort

• connectionless

• media independent

Who/what is responsible for assembling split packets after the packets reach their destination?

• upper layer services

• lower layer services

• same layer services

• IPv4