Layer 3 Networking Concepts

What is the primary function of Layer 3 (the Network Layer) in the OSI model?

• To manage physical connections between devices.

• To ensure error-free data transmission within a local network.

• To move data from one location to another across different networks.

• To format data for application use.

What are the challenges of connecting geographically separated Local Area Networks (LANs) using only Layer 2 direct point-to-point links?

• It would be too slow.

• It would be expensive and not scalable.

• It would only work for wireless connections.

• It would require different Layer 3 protocols.

What capability does the Internet Protocol (IP), a Layer-3 protocol, add to networking?

• It provides physical cabling for local networks.

• It enables direct communication between isolated Layer 2 networks.

• It adds cross-network IP addressing and routing to move data between Local Area Networks.

• It encrypts data for secure transmission.

In the context of networking, what does "encapsulation" refer to when moving IP packets?

• Compressing the data within the packet.

• Encrypting the packet for security.

• Placing an IP packet inside a frame for transmission over a specific network segment.

• Converting the packet into a different protocol.

How do routers (Layer 3 devices) move IP packets across different networks?

• They convert IP packets into electrical signals.

• They remove the current frame encapsulation and add a new one at each hop.

• They directly connect all local area networks.

• They only handle data within a single local network.

What is the primary function of Layer-3 devices (routers) in a network?

• To encapsulate frames for local networks.

• To remove frame encapsulation and add new frame encapsulation at every hop.

• To ensure packets remain the same throughout their journey.

• To convert IP packets into Ethernet frames.

What happens to an IP packet and its frame as it moves between different networks?

• The IP packet changes, but the frame remains the same.

• Both the IP packet and the frame change.

• The IP packet remains the same, but the frame changes.

• Neither the IP packet nor the frame changes.

What are the two main versions of the Internet Protocol (IP) currently in use?

• IPv1 and IPv2

• IPv4 and IPv6

• TCP and UDP

• Ethernet and PPP

Which of the following fields are essential components of an IP packet for routing data?

• Version, Header Checksum, IP Flags

• Source IP Address, Destination IP Address, Protocol

• Identification, Fragment Offset, IPOPTION

• Type Of Service, Total Length, Header Length

What is the purpose of the Time to Live (TTL) field in an IP packet?

• To specify the maximum size of the packet.

• To indicate the type of service for the packet.

• To prevent packets from endlessly looping in a network.

• To identify the source and destination IP addresses.