IPv4 Fragmentation Rules Quiz
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Questions and Answers

What is the value of the ID field in the IPv4 header for all fragments of a datagram?

  • The ID field is not used in IPv4 fragmentation
  • The ID field must be 0 for all fragments
  • The ID field carries the same value for all fragments (correct)
  • The ID field can have different values for each fragment

What must the Don't Fragment (DF) bit be set to in order for a datagram to be fragmented?

  • The DF bit must be set to 2
  • The DF bit must be set to 1
  • The DF bit must be set to 0 (correct)
  • The DF bit is not used in IPv4 fragmentation

What is the value of the More Fragments (MF) bit in the last fragment of a datagram?

  • The MF bit is 1 in all fragments except the last fragment
  • The MF bit is 1 in the last fragment
  • The MF bit is 0 in all fragments except the last fragment (correct)
  • The MF bit is not used in IPv4 fragmentation

What is the size of the data carried in the original (unfragmented) datagram?

<p>4096 bytes (A)</p> Signup and view all the answers

What is the value of the Total Length field in the first fragment of the datagram?

<p>1500 bytes (D)</p> Signup and view all the answers

What is the value of the Fragment Offset field in the second fragment of the datagram?

<p>185 (D)</p> Signup and view all the answers

What is the total length field value for the third fragment?

<p>1056 (D)</p> Signup and view all the answers

What is the value of the fragment offset field in the third fragment?

<p>370 (A)</p> Signup and view all the answers

What is the size of the data contained in the first and second fragments?

<p>2616 B (A)</p> Signup and view all the answers

What is the Maximum Transmission Unit (MTU) value used in the fragmentation process?

<p>1500 (D)</p> Signup and view all the answers

What is the size of the remaining data in the last fragment?

<p>1136 B (C)</p> Signup and view all the answers

What is the total length field value for the last fragment?

<p>1136 (B)</p> Signup and view all the answers

What field in the IPv4 header does not engage in the fragmentation process?

<p>Destination address (C)</p> Signup and view all the answers

Fragmentation of a datagram is primarily due to limitations in which network element?

<p>MTU (B)</p> Signup and view all the answers

Under what condition can a datagram NOT be fragmented?

<p>Don't fragment bit is set (D)</p> Signup and view all the answers

Which field in the IPv4 header remains unaffected by routers?

<p>Source address (B)</p> Signup and view all the answers

If a datagram has a total length that exceeds the MTU, what operation typically occurs?

<p>Fragmentation into smaller packets (D)</p> Signup and view all the answers

Flashcards

ID field in IP fragmentation

The ID field carries the same value for all fragments of a datagram.

Don't Fragment (DF) bit for fragmentation

The DF bit must be set to 0 to allow fragmentation of a datagram.

More Fragments (MF) bit in the last fragment

The MF bit is 0 in all fragments except the last fragment.

Datagram Fragmentation

A fragmented datagram is split into smaller packets to fit within the MTU limit of a network.

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Original datagram size

The size of the data carried in the original datagram before fragmentation.

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Total Length field in the first fragment

The Total Length field in the first fragment holds the size of the first fragment (1500 bytes).

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Fragment Offset field in the second fragment

The Fragment Offset field in the second fragment indicates the position within the original datagram where this fragment starts (185 bytes from the beginning).

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Total Length field in the third fragment

The total length field value for the third fragment is 1056 bytes.

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Fragment Offset field in the third fragment

The Fragment Offset field in the third fragment indicates the position within the original datagram where this fragment starts (370 bytes from the beginning).

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Data size in the first and second fragments

The first and second fragments contain a combined total of 2616 bytes of data.

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Maximum Transmission Unit (MTU)

The Maximum Transmission Unit (MTU) is the maximum size of a packet that can be transmitted over a network (1500 bytes).

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Size of data in the last fragment

The last fragment contains the remaining 1136 bytes of data.

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Total Length field in the last fragment

The Total Length field in the last fragment holds the size of the last fragment (1136 bytes).

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Destination address in fragmentation

The Destination address in the IPv4 header remains unchanged during fragmentation. Routers use the destination address to route the fragmented packets to the correct destination.

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Reason for fragmentation

Fragmentation is primarily caused by the MTU limitations of a network.

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Condition for non-fragmentation

A datagram can't be fragmented if the Don't Fragment bit is set.

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Source address in fragmentation

The Source address in the IPv4 header remains unchanged during fragmentation.

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Operation when datagram exceeds MTU

If a datagram's total length exceeds the MTU, it's usually fragmented into smaller packets to fit within the MTU limit.

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