ITI9137 Week 4

Which of the following best describes the role of the transport layer?

• Ensures reliability with segmentation and ARQ

• Addresses and routes packets between networks

• Manages physical connections and error detection

• Converts data into signals for transmission

Which type of address is used at the network layer to identify devices across networks?

• URL

• Port number

• IP address

• MAC address

Which of the following statements about IPv4 addressing is TRUE?

• IPv4 addresses are 64-bit and written in hexadecimal notation

• The subnet mask helps determine if an address is in the same subnet

• The host ID in an IP address identifies the entire network

• IPv4 does not use a hierarchy for routing

What is a key benefit of using Dynamic Host Configuration Protocol (DHCP)?

• It assigns and manages static IP addresses easily

• It automatically provides IP addresses for a limited time

• It removes the need for subnet masks in networking

• It works only with IPv6 and not with IPv4

Which of the following is true about the Domain Name System (DNS)?

• It resolves IP addresses to MAC addresses for communication

• It is a distributed database organized in a hierarchical structure

• It assigns IP addresses dynamically to network devices

• It only supports recursive lookups, not iterative ones

What is the role of Address Resolution Protocol (ARP)?

• Maps MAC addresses to IP addresses

• Assigns IP addresses to devices

• Maps IP addresses to MAC addresses

• Translates domain names to IP addresses

Which of the following is a key feature of Transmission Control Protocol (TCP)?

• It is connectionless and unreliable

• It ensures data is delivered in order

• It avoids segmenting large messages

• It only supports half-duplex communication

How does Path MTU Discovery (PMTUD) determine the optimal segment size?

• It uses a fixed MTU size for all connections

• It allows routers to fragment packets as needed

• It gradually increases packet size until an error occurs

• It sends only small packets to avoid fragmentation

What is the purpose of the acknowledgement (ACK) number in TCP?

• It indicates how many bytes have been successfully received

• It counts the total number of packets sent

• It shows the number of retransmitted packets

• It specifies the maximum segment size

How does TCP handle lost or corrupted packets without using NAKs?

• It ignores lost packets and continues transmission

• It retransmits if no ACK is received within a timeout

• It uses frame numbers to track each segment

• It sends NAKs to request missing packets