course hero what are the four fields contained within an icmp message?

What are the fields of ICMP?

ICMP packet structure After the IP header, comes the three field ICMP header. These contain a code that categories the error, a sub-code field, which refines the error code description, and then a checksum.

What does ICMP message contains?

It consists of up to 576 bytes in IPv4 and 1,280 bytes in IPv6 and includes a copy of the original error-containing IP message. The ICMP packet header comes after the IPv4 or IPv6 header. It contains three parts: type, code and checksum.

How many types of ICMP messages are there?

Table 3.2 ICMP Message TypesTypeDescription ICMP Message Types0Echo Reply (Ping Reply, used with Type 8, Ping Request)3Destination Unreachable4Source Quench5Redirect11 more rows•May 1, 2002

What is a ICMP packet used for at Layer 4?

Internet Control Message Protocol (ICMP) ICMP is used for status reporting over the Internet. ICMP provides error and control messages that are used in a variety of situations. For example, when an IP packet cannot be delivered due to a destination not being reachable a Destination Unreachable ICMP message is used.

What is the need for ICMP mention any four ICMP message and their purpose?

The ICMP stands for Internet Control Message Protocol. It is a network layer protocol. It is used for error handling in the network layer, and it is primarily used on network devices such as routers.

What are ICMP messages most commonly used to identify?

ICMP is mainly used to determine whether or not data is reaching its intended destination in a timely manner. Commonly, the ICMP protocol is used on network devices, such as routers. ICMP is crucial for error reporting and testing, but it can also be used in distributed denial-of-service (DDoS) attacks.

What is ICMP and its types?

Internet Control Message Protocol (ICMP) is a protocol used for error handling and debugging in the network layer. It is mainly used in network devices such as routers. ICMP messages are mainly divided into two categories : Error reporting messages.

What are the two main types of ICMP messages?

What are the types of ICMP message types?Error Reporting Messages.Query Messages.

What are the major types of messages in ICMP for error reporting?

ICMP uses the source IP address to send the error message to the source (originator) of the datagram. Five types of errors are handled: destination unreachable, source quench, time exceeded, parameter problems, and redirection (see figure1).

What layer is ICMP protocol?

layer 3 protocolHowever, ICMP is implemented as part of the IP layer. So ICMP processing can be viewed as occurring parallel to, or as part of, IP processing. Therefore, in the topic on TCP/IP-based layered network, ICMP is shown as a layer 3 protocol. ICMP is probably most well known as the message protocol used for the ping command.

Which of the following is true about ICMP messages?

Which of the following is true about ICMP messages? none is true: An ICMP error message may be generated for an ICMP error message. An ICMP error message may be generated for each fragment.