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IP Protocol Interview Questions & Answers - Learning Mode

IP Protocol Interview Questions & Answers - Learning Mode

The Internet Protocol (IP) is the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries. Its routing function enables internetworking, and essentially establishes the Internet. The Internet Protocol (IP) is the method or protocol by which data is sent from one computer to another on the Internet. IP specifies the format of packets, also called datagrams, and the addressing scheme. Most networks combine IP with a higher-level protocol called Transmission Control Protocol (TCP), which establishes a virtual connection between a destination and a source.

Try IP Protocol Interview Questions & Answers - Exam Mode

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IP Protocol Interview Questions & Answers - Learning Mode
Try IP Protocol Interview Questions & Answers - Exam Mode
Question: What happens to an undeliverable datagram?

Answer: An undeliverable datagram is discarded and an ICMP error message is sent to the source host. Source:
Question: Which RFC discusses IP?

Answer: RFC 791 discusses about the IP protocol version 4. Source:
Question: How a datagram becomes an undeliverable datagram?

Answer: A datagram may become undeliverable, if

1. The destination host is down.
2. The route for the destination host is not found.
3. A network in the route to the destination host is down.
4. The Time To Live (TTL) value of the datagram becomes zero. Source:
Question: What do you mean by IP is a best-effort protocol?

Answer: IP is a best-effort protocol, because it will make every effort to always transmit a datagram and also datagrams will not be just discarded. However, the delivery of the datagram to the destination is not guaranteed. Source:
Question: To which OSI layer does IP belong?

Answer: IP belongs to the Network Layer (layer 3) in the OSI model. Source:
Question: What are the different types of criteria can be specified using the TOS field?

Answer: The different types of criteria that can be specified by the TOS field in an IP datagram are:

1. Minimize delay,
2. Maximize throughput
3. Maximize reliability
4. Minimize cost and
5. Normal service. Source:
Question: How higher-level data is carried by IP to a destination host?

Answer: The data from higher-level protocols like TCP, UDP is encapsulated in an IP datagram and transmitted to the destination host. IP will not modify the higher-level data. Source:
Question: What are the fields in an IP datagram header?

Answer: The various fields in an IP datagram header and their size in bits are shown below:

| Version | 4 bits
| IP Header | 4 bits
| Length |
| Type of | 8 bits
| Service |
| Size of the | 16 bits
| Datagram |
| Datagram ID | 16 bits
| Control | 3 bits
| Flags |< Source:
Question: What is the byte order used for transmitting datagram headers in the TCP/IP protocol suite?

Answer: All the datagram headers in the TCP/IP protocol suite are transmitted in the "big endian" byte order. i.e. The most significant byte is transmitted first. This is also called as "network byte order". Source:
Question: Is the datagram identifier field unique for each IP datagram?

Answer: Yes. The IP datagram identifier field is different for each IP datagram transmitted. The fragments of an IP datagram will have the same identifier value. Source:
Question: Which version of IP is discussed in this document?

Answer: IP version 4 (IPv4) is discussed in this document. Source:
Question: An undeliverable datagram is discarded and an ICMP error message is sent to the source host.

Answer: Is it possible for an IP datagram to be duplicated? Source:
Question: What is IP?

Answer: Internet Protocol (IP) is an unreliable, best effort delivery, connection-less protocol used for transmitting and receiving data between hosts in a TCP/IP network. Source:
Question: How is the TTL field used to prevent indefinite looping of IP datagrams?

Answer: The TTL field contains a counter value set by the source host. Each gateway that processes this datagram, decreases the TTL value by one. When the TTL value reaches zero, the datagram is discarded. Source:
Question: What is the use of the Time To Live (TTL) field in the IP header?

Answer: The TTL field is used to limit the lifetime of a IP datagram and to prevent indefinite looping of IP datagrams. Source:
Question: Is it possible for an IP datagram to be duplicated?

Answer: Yes. A host may receive the same copy of an IP datagram twice. It is upto the higher layer protocols to discard the duplicate copy of the datagram. Source:
Question: What is the use of Type Of Service field in the IP header?

Answer: The Type Of Service (TOS) field is used TCP to describe the desired quality of service for an IP datagram by upper layer protocols like TCP. This field can be used to specify the nature and priority of a IP datagram (like Network Control, Immediate, Critical, etc) and the criteria for selecting a path for forwarding a datagram by a gateway. Source:
Question: What is the typical value for the TTL field?

Answer: he typical value for a TTL field is 32 or 64. Source:
Question: Is there a limitation on the minimum size of a IP datagram a network can handle?

Answer: Yes. All IP networks must be able to handle datagrams of at least 576 bytes in length. Source:
Question: How is the value for datagram identifier calculated?

Answer: The IP datagram identifier is just a sequence number assigned by the transmitting host. The algorithm for assigning value to this field is not specified by the IP protocol. Source:

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