ARP & MAC
This is used for Ethernet NIC to Ethernet NIC communications on the same network.
What is the Physical address (the MAC address)?
A 16-bit field used to identify the source application by port number.
What is Source Port?
A stateless protocol, meaning neither the client, nor the server, tracks the state of the communication session.
What is User Datagram Protocol (UDP)?
A DNS client that sends DNS messages to obtain information about the requested domain name space.
What is Resolver?
This type of message formats require a message header and a message body.
What is SMTP?
This is used to send the packet from the original source to the final destination.
What is Logical address (the IP address)?
A 32-bit field used to indicate that data has been received and the next byte expected from the source.
What is Acknowledgement Number?
A 16-bit field used to identify the source application by port number.
What is Source Port?
The action taken when a DNS server is asked to query on behalf of a DNS resolver.
What is Recursion?
This is used by an application to retrieve mail from a mail server. Mail is downloaded from the server to the client and then deleted on the server, as shown in the figure.
What is POP3?
This informs the receiving NIC that the data portion of the frame needs to be passed to the ARP process (example 0x806)
What is Type?
A 4-bit field known as ʺdata offsetʺ that indicates the length of the TCP segment header.
What is Header Length?
A 16-bit field that indicates the length of the UDP datagram header.
What is Length?
Specifies the general type of message. A value of 1 indicates a request message; a value of 2 is a reply message.
What is Operation (OP) Code?
The original messages are kept on the server until manually deleted. Users view copies of the messages in their email client software. Copies of the messages are downloaded to the client application.
What is IMAP?
The MAC address of the Ethernet NIC on the source host.
What is Source MAC address?
A 16-bit field used to indicate the number of bytes that can be accepted at one time.
What is Window Size?
A 16-bit field used for error checking of the datagram header and data.
What is Checksum?
Controls the forwarding of messages.
What is Hops?
This is a client/server file sharing protocol that describes the structure of shared network resources such as directories, files, printers, and serial ports.
What is Server Message Block (SMB)?
On a Cisco router, the _____ command is used to display the ARP table, as shown in the figure.
What is show IP ARP?
A 16-bit field used for error checking of the segment header and data.
What is Checksum?
A 16-bit field used to identify the destination application by port number.
What is Destination Port?
Identifies the number of seconds elapsed since a client began attempting to acquire or renew a lease. Used by DHCPv4 servers to prioritize replies when multiple client requests are outstanding.
What is Seconds?
This is a client/server file sharing protocol that describes the structure of shared network resources such as directories, files, printers, and serial ports
What is Trivial File Transfer Protocol (TFTP)?