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What three packets are exchanged between two hosts when establishing a tcp connection?
The SYN packet, the SYN ACK packet , And ACK packet
What type of attack involves a flooding of SYN packets to open TCP sessions to aserver?
denial of service
Does smtp use tcp?
No it uses UDP packets.
How many tcp segments flow between 2 computers to establish a tcp connection?
3. syn, syn-ack, and ack. Then you're established.
Why would an application use UDP instead of TCP?
UDP does not require as much resources as TCP but in the same time, it does not insure delivery of packets.
What kinds of available systems sufficiently secure the reliability of network transmission?
TCP does, not sure about others. TCP can handle out-of-order packets and lost packets. Even though TCP does some rudimentary error checking, corrupted packets sometimes get through.
What port does DNS operate on?
Strictly speaking, the question is invalid, as DNS uses both UDP and TCP for its transport. The expected use is for DNS to run on top of UDP, with a fall-back to TCP for data packages that can't fit into a single 8K UDP packet. Large replies and zone transfers will fall in to this category. DNS can also be configured to work exclusively over TCP, but this isn't recommended. Early MS Windows systems used DNS over TCP exclusively. Fortunately the more recent editions (XP onwards) use DNS over UDP by default, falling back to TCP only when necessary. Why UDP rather than TCP? It's simply a matter of efficiency. To start a TCP connection a minimum of three packets are required (SYN out, SYN+ACK back, ACK out). By the time you add a data packet into that and close the session off correctly you will have sent several packets. In contrast, UDP can get away with a minimum of two packets (one question, one reply). DNSSec adds a layer of complexity to this, but with caching the extra resource required can usually be mitigated against a number of queries.
How many other tcp datagrams contained a SYN bit?
budotz2x
Which system calls results in the sending of SYN packets?
connect
What protocol is used for breaking data into packets?
TCP
What service resolves out of order packets in the network layer?
TCP
What is the purpose of SYN bit in a TCP header?
In order to begin the handshake process, the client sends a SYN packet to the server. This is required to establish a synchronization with the server in order to ensure that both the client and the server will maintain and keep their exchange of packets in the right order. In order to complete the "handshake," the reponse from the server will be an ACK packet.
