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The objective of the question is to make you think about TCP connections. How does TCP establish a connection? Look at the flags that are set in the packet. (TCP part of the frame -- 4thin the list)
Also identify the source and destination IPs and ports. Notice the port number and think about the protocol you are using.
Answer:It shows the first Syn. It's the first one because the Syn doesn't have an acknowledgment with it. Therefor it's the first connection made.
This is known as the 3 way handshake
FTP Client ......................................FTP Server
-----------------SYN----------------------->
<-------------SYN----------ACK------------
-------------------ACK------------------------->
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Which protocol use the TCP port 445?
Server Message Block (SMB)( Explanation ) When NetBIOS is disabled, SMB runs over TCP/445. Kerberos runs on TCP/User Datagram Protocol (UDP)/88. RPC runs on TCP/135. HTTPS runs on TCP/443.
What is the difference between datagram and packet?
datagram is used in conectionless n/w e.g. UDP Whereas packets used in connection oriented n/w e.g. ATM X.25 tcp
Which type of attack is it when a malicious host controls a TCP session between two users?
MITM Man-In-The-Middle attack
What is the purpose of TCP or UDP port numbers?
The purpose of TCP is a connection oriented protocol, meaning that protocol establishes a connection or session between the sources and destination device prior to sending the data segment. UDP is transport layer protocol that provides an interface between the application layer and the network layer.
Where do transport layer processes occur?
transport layer processes occur between the applicaitoin layer and internet layer of the TCP/IP and between the session layer and network layer of the OSI model.
What is the difference between a segment and a datagram?
A setgement, which is also known as a TCP segment is something that is created based on an application layer of data. An IP datagram is something generated which contains the TCP segment. The segment is located in the payload section.
What are the specific port no of tcp and udp?
Port No. for Tranmission Control Protocal (TCP) is 6 Port No. for User Datagram Protocol (UDP) is 17
What is tcp session?
A TCP session is a data transfer that takes place using the transmission control protocol. A session has three phases, connection establishment, data transmission, and connection termination.
How does the TCP handle the issue of multiplexing?
tcp at the transport layer handles multiplexing with address called port number of service access points (SAP).For every service that is using TCP at one particular machine is assigned a port nuber or SAP. When the datagram is being sent the TCP software appends the SAP or the port number of the source and the destination service. At the reciving end the TCP software again extracts the destination SAP and forwards the datagram to the appropiate service. Now if there are multiple source services and multilple destination services each with a unique ID, the TCP software can distinguish between different datagram belonging to different services. Thus with the use of SAP or port numbers TCP can handle multiplexing....
Which protocol use the TCP port 445?
Server Message Block (SMB)( Explanation ) When NetBIOS is disabled, SMB runs over TCP/445. Kerberos runs on TCP/User Datagram Protocol (UDP)/88. RPC runs on TCP/135. HTTPS runs on TCP/443.
What is the difference between datagram and packet?
datagram is used in conectionless n/w e.g. UDP Whereas packets used in connection oriented n/w e.g. ATM X.25 tcp
Which is more efficent than tcp for carrying messages that fit within data package?
Udp(user datagram protocol)
Which portion of a received datagram is decoded and used by the internetwork layer of the tcpip model?
Only the Network Layer (Layer 3) portion of the datagram is used by the Network Layer (Layer 3) portion of the TCP/IP Model. The network portion of the datagram includes IP Addressing information, and things such as TTL (Time to Live), and Datagram Priority markings.
What type of attack is usually a precursor to TCP session hijacking?
Sniffing
Which tcp segment header field controls the termination of a session?
code bits
How does sctp differ from tcp?
SCTP is a protocol that has the ability to deliver functionality that is similar to TCP. Like TCP, an SCTP session can be configured to offer ordered, guaranteed, delivery with congestion control and a notion of a session. It differs in that it offers other features and has an implementation that is not directly compatible with TCP; both peers' network stacks and applications will also need to support SCTP.
Why do you have type data gram socket?
A datagram socket represents a connectionless, non-guaranteed communication protocol. It represents the UDP protocol in the TCP/IP suite.Contrast this with a stream socket, which represents a connection oriented, guaranteed, communication protocol. It represents the TCP protocol in the TCP/IP suite.UDP is the underlying protocol for TCP. If you are talking OSI model, UDP is layer 3, and TCP is layer 4.
