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30 Cards in this Set
- Front
- Back
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what is the telnet application used for?
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It allows a user on remote client machine to access resources of another machine.
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What is the ftp program/protocol used for?
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allows user to authenticate and transfer files between two machines.
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What is the application layer protocol "x window" used for?
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Defines a client/server protocol for writing client server applications based on a graphical user interface.
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what protocol takes data and breaks it into numbered segments
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tcp
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define:virtual circuit
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a connection created by using tcp between a sending host and a receiving host.
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what are some of the key features of tcp
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it is sequenced,connection oriented, reliable, larger overhead compared to udp, uses acknowledgments
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Tcp segment format: Define-sorce port
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the port number of the application on the host sending the data
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tcp segment format:define-destination port
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the port number of the application requested on the destination host.
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tcp segment format:Define-sequence number
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a number used by tcp to puts the data back in order or to retransmit missing or corrupt data.
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tcp segment format: Define-acknowledgement number
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tcp octet that is expected next
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header length
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the number of 32bit words in the tpc header.tells where the data begins.
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tcp segment format: Define-code bits
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control functions used to set up and terminate a session
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tcp segment format:define-window
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the window size the sender is willing to accept in octets.
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tcp segment format:Define-checksum
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the cyclic redunancy check. crc checks the data and header field for errors.
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tcp segment format:Define-urgent
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this value indicates the offset form th current sequence number.
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tcp segment format:define-options
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may be 0 or a multiple of 32 bits.
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tcp segment format:define-data
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the data that is handed down to the tcp protocol at the transport layer, which includes the upper layer headers.
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True or False:The upd protocol handles issues of reliability?
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false
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True or False:UDP creates a virtual circuit to establish a connection with the remote host.
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false
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tcp and udp use ____ _____ to communicate with the upper network layers to keep track of different conversations traversing the network simultaneously.
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port numbers
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what port numbers do the following protocols use.
telent,smtp,http,ftp,dns,https,snmp,tftp,dns |
23,25,80,21,53,443,161,69,53
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List 5 protocols that operate at the internet (network) layer.
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IP,ICMP,ARP,RARP,Proxy ARP
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this internet layer protocol is aware of all interconnect networks
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IP
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which protocol provides hosts with information about network problems.
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ICMP (internet control message protocol)
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Define:hop
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Determines the number of routers an IP packet is allowed to pass through.
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define:ping
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Packet Internet Groper uses ICMP echo requests and reply messages to check physical and logical connectivity.
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define traceroute
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used to discover the path a packet will take as it traverses an internetwork
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In the DoD model what two things does the internet layer provide?
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routing and providing a single network interface to the upper layers.
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Indentifing devices on a network require answering what two questions?
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what network is the device on, and what is its hardware address.
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what are two characteristics of icmp packets
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They provide host with information about network problems and they are encapsulated in ip datagrams.
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