Of the following characteristics, which apply to UDP?
Answer Posted / pachicoo
Comparison of UDP and TCP (Transport Layer)
Transmission Control Protocol is a connection-oriented
protocol, which means that it requires handshaking to set
up end-to-end communications. Once a connection is set up
user data may be sent bi-directionally over the connection.
Reliable – TCP manages message acknowledgment,
retransmission and timeout. Many attempts to reliably
deliver the message are made. If it gets lost along the
way, the server will re-request the lost part. In TCP,
there's either no missing data, or, in case of multiple
timeouts, the connection is dropped.
Ordered – if two messages are sent over a connection in
sequence, the first message will reach the receiving
application first. When data segments arrive in the wrong
order, TCP buffers the out-of-order data until all data can
be properly re-ordered and delivered to the application.
Heavyweight – TCP requires three packets to set up a socket
connection, before any user data can be sent. TCP handles
reliability and congestion control.
Streaming – Data is read as a byte stream, no
distinguishing indications are transmitted to signal
message (segment) boundaries.
UDP is a simpler message-based connectionless protocol.
Connectionless protocols do not set up a dedicated end-to-
end connection. Communication is achieved by transmitting
information in one direction from source to destination
without verifying the readiness or state of the receiver.
Unreliable – When a message is sent, it cannot be known if
it will reach its destination; it could get lost along the
way. There is no concept of acknowledgment, retransmission
Not ordered – If two messages are sent to the same
recipient, the order in which they arrive cannot be
Lightweight – There is no ordering of messages, no tracking
connections, etc. It is a small transport layer designed on
top of IP.
Datagrams – Packets are sent individually and are checked
for integrity only if they arrive. Packets have definite
boundaries which are honored upon receipt, meaning a read
operation at the receiver socket will yield an entire
message as it was originally sent.
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