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[SS25] Advanced Mobile Communication Networks

[SS25] Advanced Mobile Communication Networks

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What is the purpose of the checksum field in the IP header?

Compute the checksum of the IP header excluding the TTL field

Compute the checksum of the IP header

Compute the checksum of the IP packet

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What is the functionality of DHCP?

Provides a MAC address

Provides an IP address

Resolves a MAC address

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What is the purpose of the protocol field in the IP header?

To support the proper decapsulation of the packet at the receiver side

To support protocol authentication

To ensure proper link layer processing

To support the interpretation of the IP data part

Identify the protocol used on top of IP

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How does error handling work for the case that UDP is used?

UDP uses retransmission for the case of errors

Errors could be handled by the protocols run on top of UDP if needed

UDP discards segment in the case of errors but doesn´t retransmit

Errors are ignored

UDP expects that errors are detected by the IP protocol

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Why does TCPs response to timeouts differ from the response for DUPACKs?

A DUPACK implies a minor congestion problem

A DUPACK indicates that the arrived segment is not in the right order

A timeout indicates that there has not been a successful transmission during the duration of the timeout

A raised timeout indicates a severe congestion problem

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What is the purpose of the MSS?

Prevent fragmentation of the TCP packet on its path from sender to receiver

To inform the peer about the limits of its link interface

To avoid the fragmentation of packets on intermediate routers

To avoid reassembly of previously segmented packets in intermediate routers

Prevent fragmentation of the TCP packet on the first and last hop

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What is the purpose of the TCP checksum field?

To discard TCP/IP packets that have incurred errors during transmission

It allows to detect errors in the address fields of the IP header

It allows to detect errors occurring to the TCP header fields

It allows to detect errors of the data included in the IP data field

It is used to check for errors incurred during the transmission

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What is the purpose of the ACK flag?

Indicate if the 32-bit acknowledgement in the segment should be interpreted or not

Indicate if we have an ACK or a DUPACK

Indicate if the segment includes information about acknowledgements

Indicate if the included data require a prompt acknowledgement

Indicate if the segment should be acknowledged or not

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Which statements hold with respect to a timeout raised at the sender? (single answer)

It indicates that there is a transmission problem in at least one direction

It indicates that there is a transmission problem from receiver to sender

It indicates that there is a transmission problem from sender to receiver

It indicates that there is a transmission problem in both directions

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How does the TCP congestion control algorithm in the sender react to overload problems? Mark all correct options?

Reduce the congestion window

Reduce the congestion window to 1

Reduce the congestion window to the size of a single segment

Half the data rate of the transmission

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