Explain ICMP protocol. Describe the header format of ICMP.

Explain ICMP protocol. Describe the header format of ICMP.
by

1 Answer

Answer :

The Internet Control Message Protocol (ICMP) supports the unreliable and connectionless Internet Protocol (IP). * ICMP messages are encapsulated in IP datagrams. There are two categories of ICMP messages: error-reporting and query messages. The error-reporting messages report problems that a router or a host (destination) may encounter when it processes an IP packet. The query messages, which occur in pairs, help a host or a network manager get specific information from a router or another host. * The checksum for ICMP is calculated using both the header and the data fields of the ICMP message. * There are several tools that can be used in the Internet for debugging. We can find if a host or router is alive and running. Two of these tools are ping and traceroute.


Header Format:
electronics2electrical.com 614 - .jpg
An ICMP message has an 8-byte header and a variable-size data section. Although the general format of the header is different for each message type, the first 4 bytes are common to all. As Figure shows, 
* The first field, ICMP type, defines the type of the message. * The code field specifies the reason for the particular message type. * The last common field is the checksum field for checking errors * The rest of the header is specific for each message type. * The data section in error messages carries information for finding the original packet that had the error. In query messages, the data section carries extra information based on the type of the query.
by
edited

Related questions

Describe the HTTP response message format.

Description : Describe the HTTP response message format.

Last Answer : Status Line  Status line shows status for the response it indicates response status using a code as well as a status phrase. The status-Line begins with a protocol version, then status code and status phrase. ... fields Body It contains actual content. This part is optional. OR

Describe the RIP message format.

Description : Describe the RIP message format.

Last Answer : RIP(Routing Information Protocol) message format * RIP is routing protocol based on Distance Vector Routing algorithm which is an intradomain (interior) routing protocol used inside an autonomous ... 32-bit field defines the hop count from the advertising router to the destination network

State the use of 6 flags in TCP header.

Description : State the use of 6 flags in TCP header.

Last Answer : There are 6, 1-bit control bits that control connection establishment, termination, abortion, flow control etc.. 1) URG: Urgent pointer If this bit field is set the receiving TCP should ... 6) FIN: No more data from sender. If this bit is set then it terminates the connection.

Which field/s of ICMPv6 packet header has/have a provision of minimal integrity level concerning to verification for ICMP messages? a. Type b. Code c. Checksum d. All of the above

Description : Which field/s of ICMPv6 packet header has/have a provision of minimal integrity level concerning to verification for ICMP messages? a. Type b. Code c. Checksum d. All of the above

Last Answer : c. Checksum

In packet-filtering router, the following information can be external from the packet header. i) Source IP address ii) Destination IP address iii) TCP/UDP source port iv) ICMP message type v) TCP/UDP destination port A) i, ii, iii and iv only B) i, iii, iv and v only C) ii, iii, iv and v only D) All i, ii, iii, iv and v

Description : In packet-filtering router, the following information can be external from the packet header. i) Source IP address ii) Destination IP address iii) TCP/UDP source port iv) ICMP message type v) TCP/UDP destination port A) i, ii, ... iv and v only C) ii, iii, iv and v only D) All i, ii, iii, iv and v

Last Answer : D) All i, ii, iii, iv and v

In packet-filtering router, the following information can be external from the packet header. i) Source IP address ii) Destination IP address iii) TCP/UDP source port iv) ICMP message type v) TCP/UDP destination port A) i, ii, iii and iv only B) i, iii, iv and v only C) ii, iii, iv and v only D) All i, ii, iii, iv and v

Description : In packet-filtering router, the following information can be external from the packet header. i) Source IP address ii) Destination IP address iii) TCP/UDP source port iv) ICMP message type v) TCP/UDP destination port A) i, ii ... and v only C) ii, iii, iv and v only D) All i, ii, iii, iv and v

Last Answer : D) All i, ii, iii, iv and v

ICMP is a _________ layer protocol. A) datalink B) transport C) network D) noneof the above

Description : ICMP is a _________ layer protocol. A) datalink B) transport C) network D) noneof the above

Last Answer : network

ICMP (Internet Control Message Protocol) is A. a TCP/IP protocol used todynamically bind ahigh level IP Address to alow-level physical hardware address B. a TCP/IP high level protocol for transferring filesfrom one machine to another C. a protocol used to monitor computersD.a protocol that handles error andcontrol messagesE.None of the above

Description : ICMP (Internet Control Message Protocol) is A. a TCP/IP protocol used todynamically bind ahigh level IP Address to alow-level physical hardware address B. a TCP/IP high level protocol for transferring ... to monitor computers D. a protocol that handles error andcontrol messages E. None of the above

Last Answer : a protocol that handles error andcontrol messages

The Internet Control Message Protocol (ICMP) A. allows gateways to send error acontrol messages toother gateways or hosts B. provides communication between the Internet Protocol Software on one machine and the InternetProtocol Software on another C. reports error conditions tothe original source, the source must relate errors to individual applicationprograms and takeaction to correct theproblem D. All of theabove E. None of the above

Description : The Internet Control Message Protocol (ICMP) A. allows gateways to send error acontrol messages toother gateways or hosts B. provides communication between the Internet Protocol Software on one machine ... and takeaction to correct theproblem D. All of theabove E. None of the above

Last Answer : All of theabove

A layer-4 firewall (a device that can look at all protocol headers up to the transport layer) CANNOT a. block entire HTTP traffic during 9:00PM and 5 :0OAM b. block all ICMP trafficc. stop incoming traffic from a specific IP address but allow outgoing traffic to the same IP address d. block TCP traffic from a specific user on a multi-user system during 9:00PM and 5:00AM

Description : A layer-4 firewall (a device that can look at all protocol headers up to the transport layer) CANNOT a. block entire HTTP traffic during 9:00PM and 5 :0OAM b. block all ICMP traffic c. stop ... address d. block TCP traffic from a specific user on a multi-user system during 9:00PM and 5:00AM

Last Answer : d. block TCP traffic from a specific user on a multi-user system during 9:00PM and 5:00AM

ICMP stands for __________ a. Internet Coordinate Message Protocol b. Internet Control Message Protocol c. Interconnect Control Message Protocol d. Interconnect Coordinate Message Protocol

Description : ICMP stands for __________ a. Internet Coordinate Message Protocol b. Internet Control Message Protocol c. Interconnect Control Message Protocol d. Interconnect Coordinate Message Protocol

Last Answer : b. Internet Control Message Protocol

Which protocol does switch use at the layer 2 for finding MAC address? a. ICMP b. UDP c. ARP d. TCP

Description : Which protocol does switch use at the layer 2 for finding MAC address? a. ICMP b. UDP c. ARP d. TCP

Last Answer : c. ARP

State weather the following statement is true or false for Internetwork layer. 1).Other internetwork-layer protocols are IP, ICMP, IGMP, ARP, and RARP. 2). Internet Protocol (IP) is the least important protocol in this layer 3). The internetwork layer, also called the internet layer or the network layer, provides the “virtual network” A. 1. True, 2. true, 3. true B. 1. true, 2. false, 3.true C. 1. false, 2. false, 3. false D. 1. true, 2. true, 3. false

Description : State weather the following statement is true or false for Internetwork layer. 1).Other internetwork-layer protocols are IP, ICMP, IGMP, ARP, and RARP. 2). Internet Protocol (IP) is the least important protocol in this layer ... 3.true C. 1. false, 2. false, 3. false D. 1. true, 2. true, 3. false

Last Answer : B. 1. true, 2. false, 3.true

Which protocol carries messages such as destination Unreachable, Time Exceeded, Parameter Problem, Source Quench, Redirect, Echo, Echo Reply, Timestamp, Information Request, Information Reply, Address Request, and Address Reply? * ICMP * UDP * TCP * TFTP

Description : Which protocol carries messages such as destination Unreachable, Time Exceeded, Parameter Problem, Source Quench, Redirect, Echo, Echo Reply, Timestamp, Information Request, Information Reply, Address Request, and Address Reply? * ICMP * UDP * TCP * TFTP

Last Answer : Correct answer: A ICMP (Internet Control Message Protocol) is a network layer internet protocol described in RFC # 792. ICMP reports IP packet information such as destination Unreachable, Time ... Echo Reply, Timestamp, Information Request, Information Reply, Address Request, and Address Reply.

………………….. is responsible for converting the higher level protocol addresses (IP addresses) to physical network addresses. A) Address Resolution Protocol (ARP) B) Reverse Address Resolution Protocol (RARP) C) Bootstrap Protocol (BOOTP) D) Internet Control Message Protocol (ICMP)

Description : ………………….. is responsible for converting the higher level protocol addresses (IP addresses) to physical network addresses. A) Address Resolution Protocol (ARP) B) Reverse Address Resolution Protocol (RARP) C) Bootstrap Protocol (BOOTP) D) Internet Control Message Protocol (ICMP)

Last Answer : A) Address Resolution Protocol (ARP)

The most important and common protocols associated TCP/IP internetwork layer are. i) Internet protocol(IP) ii) Internet control Message Protocol(ICMP) iii) Bootstrap Protocol (BooTP) iv) Dynamic Host Configuration Protocol (DHCP) v) Address Resolution Protocol (ARP) A) i, ii, iii and iv only B) i, iii, iv and v only C) ii, iii, iv and v only D) All i, ii, iii, iv and v

Description : The most important and common protocols associated TCP/IP internetwork layer are. i) Internet protocol(IP) ii) Internet control Message Protocol(ICMP) iii) Bootstrap Protocol (BooTP) iv) Dynamic Host Configuration Protocol (DHCP) v) ... C) ii, iii, iv and v only D) All i, ii, iii, iv and v

Last Answer : D) All i, ii, iii, iv and v

........ is responsible for converting the higher level protocol addresses to physical Network Addresses. A) Address Resolution Protocol (ARP) B) Reverse Address Resolution Protocol (RARP) C) Bootstrap Protocol (BOOTP) D) Internet Control Message Protocol (ICMP)

Description : ........ is responsible for converting the higher level protocol addresses to physical Network Addresses. A) Address Resolution Protocol (ARP) B) Reverse Address Resolution Protocol (RARP) C) Bootstrap Protocol (BOOTP) D) Internet Control Message Protocol (ICMP)

Last Answer : D) Internet Control Message Protocol (ICMP)

The most important and common protocols associated TCP/IP internetwork layer are. i) Internet Protocol (IP) ii) Internet Control Message Protocol (ICMP) iii) Bootstrap Protocol (BOOTP) iv) Dynamic Host Configuration Protocol (DHCP) V) Address Resolution Protocol (ARP) A) i, ii, iii, and iv only B) ii, iii, iv and v only C) i, iii, iv and v only D) All i, ii, iii, iv and v only

Description : The most important and common protocols associated TCP/IP internetwork layer are. i) Internet Protocol (IP) ii) Internet Control Message Protocol (ICMP) iii) Bootstrap Protocol (BOOTP) iv) Dynamic Host Configuration Protocol (DHCP) V) ... C) i, iii, iv and v only D) All i, ii, iii, iv and v only

Last Answer : D) All i, ii, iii, iv and v only

........... is responsible for converting the higher level protocol addresses to physical Network Addresses. A) Address Resolution Protocol (ARP) B) Reverse Address Resolution Protocol (RARP) C) Bootstrap Protocol (BOOTP) D) Internet Control Message Protocol (ICMP)

Description : ........... is responsible for converting the higher level protocol addresses to physical Network Addresses. A) Address Resolution Protocol (ARP) B) Reverse Address Resolution Protocol (RARP) C) Bootstrap Protocol (BOOTP) D) Internet Control Message Protocol (ICMP)

Last Answer : A) Address Resolution Protocol (ARP)

The most important and common protocols associated TCP/IP internetwork layer are. i) Internet Protocol (IP) ii) Internet Control Message Protocol (ICMP) iii) Bootstrap Protocol (BOOTP) iv) Dynamic Host Configuration Protocol (DHCP) V) Address Resolution Protocol (ARP) A) i, ii, iii, and iv only B) ii, iii, iv and v only C) i, iii, iv and v only D) All i, ii, iii, iv and v only

Description : The most important and common protocols associated TCP/IP internetwork layer are. i) Internet Protocol (IP) ii) Internet Control Message Protocol (ICMP) iii) Bootstrap Protocol (BOOTP) iv) Dynamic Host Configuration Protocol (DHCP) V) ... C) i, iii, iv and v only D) All i, ii, iii, iv and v only

Last Answer : D) All i, ii, iii, iv and v only

7.How does traceroute work? A. It uses an ICMP destination-unreachable message to elicit the name of a router. B. It sends a specially crafted IP packet to a router to locate the number of hops from the sender to the destination network. C. It uses a protocol that will be rejected by the gateway to determine the location. D. It uses the TTL value in an ICMP message to determine the number of hops from the sender to the router.

Description : 7.How does traceroute work? A. It uses an ICMP destination-unreachable message to elicit the name of a router. B. It sends a specially crafted IP packet to a router to locate the number of hops from ... the TTL value in an ICMP message to determine the number of hops from the sender to the router.

Last Answer : D. It uses the TTL value in an ICMP message to determine the number of hops from the sender to the router.

Which protocol does hackers use to make their system seems as your system or another allowed host on your network? a. SNMP protocol b. TCP protocol c. ARP protocol d. ICMP protocol

Description : Which protocol does hackers use to make their system seems as your system or another allowed host on your network? a. SNMP protocol b. TCP protocol c. ARP protocol d. ICMP protocol

Last Answer : c. ARP protocol

In mla format the running header goes?

Description : In mla format the running header goes?

Last Answer : What is the answer ?

In the TCP/IP protocol suite, which one of the following is NOT part of the IP header? a. Fragment Offset b. Source IP address c. Destination IP address d. Destination port number

Description : In the TCP/IP protocol suite, which one of the following is NOT part of the IP header? a. Fragment Offset b. Source IP address c. Destination IP address d. Destination port number

Last Answer : d. Destination port number

For which one of the following reasons does Internet Protocol (IP) use the time-to- live (TTL) field in the IP datagram header? a. Ensure packets reach destination within that time b. Discard packets that reach later than that time c. Prevent packets from looping indefinitely d. Limit the time for which a packet gets queued in intermediate routers.

Description : For which one of the following reasons does Internet Protocol (IP) use the time-to- live (TTL) field in the IP datagram header? a. Ensure packets reach destination within that time b. ... packets from looping indefinitely d. Limit the time for which a packet gets queued in intermediate routers.

Last Answer : c. Prevent packets from looping indefinitely

Which provision can resolve / overcome the shortcomings associated with duplication or failure condition of Stop and Wait Automatic Repeat Request protocol especially due to loss of data frames or non reception of acknowledgement? a. Provision of sequence number in the header of message b. Provision of checksum computation c. Both a & b d. None of the above

Description : Which provision can resolve / overcome the shortcomings associated with duplication or failure condition of Stop and Wait Automatic Repeat Request protocol especially due to loss of data frames or non reception ... message b. Provision of checksum computation c. Both a & b d. None of the above

Last Answer : Provision of sequence number in the header of message

State weather the following statement is true or false for IPV6 Addressing 1). IPV6 is a routable protocol that addresses, routes, fragments, and reassembles packets 2).IPV6 is a connectionless, unreliable datagram protocol. 3). An IPV6 packet consists of an IPV6 header and an IPV6 payload. A. 1. True, 2. true, 3. true B. 1. true, 2. false, 3. false C. 1. false, 2. false, 3. false D. 1.false, 2. true, 3. true

Description : State weather the following statement is true or false for IPV6 Addressing 1). IPV6 is a routable protocol that addresses, routes, fragments, and reassembles packets 2).IPV6 is a connectionless, unreliable datagram protocol. 3). ... C. 1. false, 2. false, 3. false D. 1.false, 2. true, 3. true

Last Answer : A. 1. True, 2. true, 3. true

Explain TCP connection management with the help of TCP connection management finite state machine.

Description : Explain TCP connection management with the help of TCP connection management finite state machine.

Last Answer : To keep track of all the different events happening during connection establishment, connection termination, and data transfer, TCP is specified as the Finite State Machine -FSM TCP ... , a server transitions through a solid line or a client transitions through a dotted line.

Explain how TCP connections are established using the 3 way handshake. What happens when 2 hosts simultaneously try to establish a connection?

Description : Explain how TCP connections are established using the 3 way handshake. What happens when 2 hosts simultaneously try to establish a connection?

Last Answer : If 2 host Simultaneously try to establish connection: Simultaneous Open: * It's possible for two applications to send a SYN to each other to start a TCP connection, although the possibility is small, ... . * The CLOSING state takes the place of FIN-WAIT-2 or CLOSEWAIT in a common scenario.

Explain about standard and non standard protocols at the application layer.

Description : Explain about standard and non standard protocols at the application layer.

Last Answer : HTTP The Hypertext Transfer Protocol (HTTP) is a Application layer protocol used mainly to access data on the World Wide Web. HTTP uses the services of TCP on well-known port 80. FTP ... starts with the client when the user needs to download e-mail from the mailbox on the mail server.

Explain the TCP connection establishment using a three way handshake mechanism.

Description : Explain the TCP connection establishment using a three way handshake mechanism.

Last Answer : Connection Establishment TCP uses a Three way handshaking mechanism to establish a connection between client and server machines. The three steps in three way handshaking mechanism are as follows.  SYN: ... This is just an ACK segment. It guarantees the completion of three way handshaking.

Explain the working of TELNET.

Description : Explain the working of TELNET.

Last Answer : TELNET: TELNET is an abbreviation for TErminaLNETwork. It is the standard TCP/IP protocol for virtual terminal service. TELNET Working: * TELNET is a client-server application that allows a user ... the characters to the appropriate application program.  Fig. Working of TELNET 

Explain different transition method of IPv4 to IPv6.

Description : Explain different transition method of IPv4 to IPv6.

Last Answer : Three Transition from IPv4 to IPv6 strategies are 1. Dual Stack 2. Tunnelling 3. Header Translation  1. DUAL STACK  In this kind of strategy a station has a dual stack of protocols run IPv4 and ... of the IPv6 packet is converted to an IPv4 header see figure. Fig. Header Translation

Explain difference between distance vector and link state routing.

Description : Explain difference between distance vector and link state routing. 

Last Answer : Distance Vector Routing Link State Routing Routing tables are updated by exchanging information with the neighbours.  Complete topology is distributed to every router to update a routing table. ... Harder to configure Count to infinity problem No count to infinity problem

Explain working of WWW.

Description : Explain working of WWW.

Last Answer : The Web is a repository of information in which the documents, called web pages, are distributed all over the world and related documents are linked together. The WWW today is a distributed client- ... the web server. Each time a request arrives, the corresponding document is sent to the client. 

Application layer protocol defines ____ a.types of messages exchanged b.message format, syntax and semantics c.rules for when and how processes send and respond to messages d.all of the mentioned

Description : Application layer protocol defines ____ a.types of messages exchanged b.message format, syntax and semantics c.rules for when and how processes send and respond to messages d.all of the mentioned

Last Answer : d.all of the mentioned

------------------- is a set of rules governing the format and meaning of the packets, or messages that are exchanged by the peer entities within a layer. a. Interface b. Reference model c. Protocol d. None of these

Description : ------------------- is a set of rules governing the format and meaning of the packets, or messages that are exchanged by the peer entities within a layer. a. Interface b. Reference model c. Protocol d. None of these

Last Answer : c. Protocol

A set of guidelines or standards that establish the format in which files can be transmitted from one computer to another is: a) Protocol for Files b) File Transfer Protocol c) Managing File Protocol d) None of These

Description : A set of guidelines or standards that establish the format in which files can be transmitted from one computer to another is: a) Protocol for Files b) File Transfer Protocol c) Managing File Protocol d) None of These

Last Answer : b) File Transfer Protocol

Construct a diagram to show the application of cookies in a scenario in which the server uses cookies for advertisement.

Description : Construct a diagram to show the application of cookies in a scenario in which the server uses cookies for advertisement.

Last Answer : Use of Cookies for advertisements:  A cookie is also used by advertising agencies. An advertising agency can place banner ads on some main website that is often visited by users. The advertising agency supplies only ... the user is sent and stored in the file, which are used by the server. 

Compare TCP and UDP

Description : Compare TCP and UDP

Last Answer : Characteristics TCP UDP Connection TCP is connection oriented Protocol UDP is connection less Protocol  Reliability It provides reliable delivery of messages It provides unreliable delivery of ... FTP, Telnet, SMTP, DNS, HTTP, POP DNS, BOOTP, DHCP, TFTP, RIP

State the concept of fragmentation in IPv4.

Description : State the concept of fragmentation in IPv4. 

Last Answer : Fragmentation: When the maximum size of datagram is greater than maximum size of data that can be held a frame then the network layer divides the datagram received from x-port layer into ... copied into the fragment header. The three fields Flags, Fragmentation offset and Total length are altered.

State the transmission modes of FTP.

Description : State the transmission modes of FTP.

Last Answer : Transmission modes of FTP: 1. Stream mode 2. Block mode 3. Compressed mode

List two advantages of using UDP over TCP.

Description : List two advantages of using UDP over TCP.

Last Answer : Advantages of using UDP over TCP : 1) UDP is connection less and unreliable transport layer protocol. i.e. It does not require to maintain a connection. 2) UDP is transaction oriented and ... UDP is faster since it does not require acknowledgment. 4) Useful when time sensitivity is more important

State the need of domain name system.

Description : State the need of domain name system.

Last Answer : Need of domain name system: * Since IP addresses are difficult to remember and names are easier to remember Domain Name System is used and DNS servers are used for converting these names into IP addresses. * ... to internet. Use for mapping can map a name to an address or an address to a name. 

State the four advantages of IPv6.

Description : State the four advantages of IPv6.

Last Answer : Advantages of IPv6: * Larger address space. * Better header format. * New options for additional functionalities. * Allowance for extension. * Support for more security. * ... Simplified Network configuration * Support for new services * Support for Security * Auto configuration

Differentiate between IPv4 and IPv6.

Description : Differentiate between IPv4 and IPv6.

Last Answer : IPv4 IPv6 1. Source and destination addresses are 32 bits (4 bytes) in length. 1. Source and destination addresses are 128 bits(16 bytes) in length. 2. Uses broadcast ... Uses host address (AAAA) resource records in the domain name system to map host names to IPv6 addresses

What is ICMP ?

Description : What is ICMP ?

Last Answer : This ICMP ( Internet Control Message Protocol) protocol works with transmission errors . This ICMP uses TCP / IP and Ping utilities.

Which of the following is true about ICMP messages? A) An ICMP error message may be generated for an ICMP error message. B) An ICMP error message may be generated only for the first fragment. C) An ICMP error message may be generated for a multicast datagram. D) noneis true

Description : Which of the following is true about ICMP messages? A) An ICMP error message may be generated for an ICMP error message. B) An ICMP error message may be generated only for the first fragment. C) An ICMP error message may be generated for a multicast datagram. D) noneis true

Last Answer : An ICMP error message may be generated only for the first fragmen

Which of the following is true about ICMP messages? A) An ICMP error message may be generated for an ICMP error message. B) An ICMP error message may be generated for each fragment. C) An ICMP error message may be generated for a multicast datagram. D) noneis true

Description : Which of the following is true about ICMP messages? A) An ICMP error message may be generated for an ICMP error message. B) An ICMP error message may be generated for each fragment. C) An ICMP error message may be generated for a multicast datagram. D) noneis true

Last Answer : noneis true

An ICMP message has _____ headerand a variable-size data section. A) a 16-byte B) a 32-byte C) an 8-byteD) noneof the above

Description : An ICMP message has _____ headerand a variable-size data section. A) a 16-byte B) a 32-byte C) an 8-byte D) noneof the above

Last Answer : an 8-byte