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When a client computer sends a request to a Domain Name System (DNS) server, what type of packet is sent?
DNS primarily uses the User Datagram Protocol (UDP) on port number 53 to serve requests. DNS queries consist of a single UDP request from the client followed by a single UDP reply from the server. When the length of the answer exceeds 512 bytes and both client and server support EDNS, larger UDP packets are used.
How the operating system knows the difference between tcp and udp packet?
The "packets" are actually called "segments" in the case of layer 4 (i.e., TCP or UDP).When creating an IP packet, a host (computer, or other equipment that participates in a communication) adds information to the "protocol" field. This indicates whether the IP packet transports a TCP segment, a UDP segment, or some other kind of information.The "packets" are actually called "segments" in the case of layer 4 (i.e., TCP or UDP).When creating an IP packet, a host (computer, or other equipment that participates in a communication) adds information to the "protocol" field. This indicates whether the IP packet transports a TCP segment, a UDP segment, or some other kind of information.The "packets" are actually called "segments" in the case of layer 4 (i.e., TCP or UDP).When creating an IP packet, a host (computer, or other equipment that participates in a communication) adds information to the "protocol" field. This indicates whether the IP packet transports a TCP segment, a UDP segment, or some other kind of information.The "packets" are actually called "segments" in the case of layer 4 (i.e., TCP or UDP).When creating an IP packet, a host (computer, or other equipment that participates in a communication) adds information to the "protocol" field. This indicates whether the IP packet transports a TCP segment, a UDP segment, or some other kind of information.
IP TCP and UDP all discard a packet that arrives with a checksum error and do not?
Only TCP will automatically discard a packet with a bad checksum. UDP packets have a checksum field, but it is rarely used, and then only by the application (not UDP itself)
Is a UDP packet smaller than a TCP packet?
In general, yes, using UDP transport will use a smaller packet than TCP. UDP generally assumes that the complete message will fit within a single packet, unlike TCP which will segment or break apart a message into multiple packets for guaranteed reliable delivery. UDP has no such requirement to deliver anything within a reliable framework and would like to keep the entire message within a single packet and eliminate the segmentation and reassembly process.
Write Client and server program in C language using UDP?
Write and run a client and a server program in C-language using UDP
Is there any load balancer for udp servers?
In theory many of the major companies can load balance UDP traffic, but with warnings - UDP, unlike TCP is connectionless and doesn't ever care of a packet is sent back; It will keep sending. The "short-lived" protocol doesn't have all of the information sent in a TCP packet, therefor it is hard to say if the packet was trasnmitted through the port, to the correct computer, returned through the port, and was received back by the client transmission. Because of this, load balancing with UDP is not as well supported as many people would like. If you are architecting a solution that doesn't require the packet to be sent back, but need the scalability of a load-balancer, it still may be a huge benefit.
Are both UDP and IP unreliable to the same degree?
When IP sends a packet, it receives a confirmation for each packet and, if needed, rebroadcast the packet. This makes it reliable. UDP does not get confirmation. It broadcast each packet only once and assumes that it get to you. This makes it less reliable then IP because it does not check for problems or rebroadcast.
The OSPF packet format has a checksum field but the RIP packet does not why?
RIP messages are wrapped in a UDP package, which already has a checksum.
What does a client do when it has UDP datagrams to send?
When a client wishes to send a UDP datagram there is nothing that they are required to except to send it. The datagram will use a checksum to verify the integrity of the datagram and deliver it where it needs to go.
What is the difference between packet filtering and stateful inspection?
Packet Filtering:permits or denies traffic based onsource/destination IP addresses, or TCP/UDP port numbers usingAccess Control Lists (ACLs)Stateful Packet Inspection:Tracks TCP and UDP sessions in a flowtable, using the Adaptive Security Algorithm.
What is a characteristic of UDP?
Connectionless connection ie Computer A does not care if computer B receives the Packet of data or not, Computer A simply sends the packet to computer B.
What does a client application select for a TCP or UDP source port number?
What a client application usually selects for a TCP or UDP source port number is a random value. The value selected is generally in the range of the registered ports.
