Questions and Answers
Data packet for IP name is?
IP Datagram
The header contains the version which is ___ bits.
4
What does the service type field specify?
Quality of service (QoS)
What does the total length field indicate?
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What is the maximum size of a single IP datagram?
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What does the flag field indicate?
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What is fragmentation?
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What does the Time to Live (TTL) field indicate?
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What does the protocol field contain information about?
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What is the header checksum used for?
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Source IP address is how many bits long?
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Destination IP address is how many bits long?
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IP options field is used to set ___ characteristics for datagrams.
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What is the purpose of the IP options padding field?
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Encapsulation refers to what in terms of IP datagrams?
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Study Notes
IP Datagram Overview
- An IP Datagram is a structured data packet used at the network layer (Layer 3) of the OSI model.
- It consists of two primary sections: the header and the payload.
IP Datagram Header
- The header contains a version field (4 bits) indicating the IP protocol version, with IPv4 being the most common.
- A header length field specifies the length (typically 20 bytes for IPv4).
- Service type field (8 bits) indicates quality of service (QoS) details for prioritization among packets.
Total Length Field
- This field indicates the complete length of the IP datagram, including both header and payload.
Identification Field
- A 16-bit field that groups IP datagrams; the maximum size is 65,535 bytes.
- If data exceeds this size, it is divided into smaller packets which share the same identification number.
Flag Field
- This field indicates whether the datagram can be fragmented or whether it has already been split into smaller pieces.
Fragmentation
- Fragmentation is the process of dividing a single IP datagram into several smaller datagrams for transmission.
Time to Live (TTL) Field
- An 8-bit field that determines how many router hops a datagram can traverse before being discarded.
- It prevents infinite loops in routing scenarios.
Protocol Field
- An 8-bit field that specifies which transport layer protocol (e.g., TCP or UDP) is being used.
Header Checksum
- Functions similarly to an Ethernet checksum to verify data integrity and detect corruption in the packet.
Source IP Address
- A 32-bit field representing the originating IP address of the data packets.
Destination IP Address
- A 32-bit field indicating the target IP address where the data packets are being sent.
IP Options Field
- An optional field used to set special characteristics for datagrams, mostly for testing purposes.
IP Options Padding Field
- Comprises a series of zeros to ensure that the header reaches the correct total size.
Encapsulation
- The entire IP datagram is encapsulated as the payload within an Ethernet frame.
- This payload contains either a TCP or UDP packet, ensuring proper delivery across networks.
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Description
This quiz covers the structure and components of an IP datagram, focusing on its header and payload. Key topics include the version field, header length, total length, identification, and flags for fragmentation. Test your knowledge on how these features interact within the network layer.
