What field in the IP header determines the transport layer protocol that handles the contents of the packet?…
5. What is the destination port for the DNS query message? What is the source port…
• A port with a full memory buffer can cause frames for available ports to be delayed.…
Because the frame header contains everything that it needs to get from the source to the destination without having to go through the higher addressing, it’s not going out to another network so it doesn’t need to have its headers changed.…
What process is used by a DNS server to add a UDP header to the contents of a DNS query response, followed by adding an IP header, and then adding a data link header and trailer is an example of what?…
At the destination this layer is responsible for combining the packets into their original state. This layer also checks to see if the layers are in the right order when received and not in duplicated form. If there is an error in one of the packets there is a request for that packet's retransmission. There are two protocols that sit at this layer. First, the TCP protocol connects the sender and the receiver using a socket which is determined by the IP address and port number. TCP keeps track of the packet delivery order and which ones need to be resent. UDP on the other hand is a connectionless communication and does not guarantee packet delivery between sender and receiver. Because it is connectionless the sender sends the data into the network with an IP address of the receiver and hopes it makes it to its destination. Since there is not a way of asking the sender to retransmit because of an error there is little error protection if…
What Field in the TCP header contains a well known port number that maps to the Application that will handle the segment Data Stream?…
Gives system addressing and routing, and does so in such a manner as additionally to give a regular address space across numerous lower-level protocols. This makes conceivable the interconnection of systems that describes the Internet. The IP protocol works at this level.…
In order to do so, the packet analyzer must “understand” the structure of all messages exchanged by protocols. For example, suppose we are interested in displaying the various fields in messages exchanged by the HTTP protocol in Figure 1. The packet analyzer understands the format of Ethernet frames, and so can identify the IP datagram within an Ethernet frame. It also understands the IP datagram format, so that it can extract the TCP segment within the IP datagram. Finally, it understands the TCP segment structure, so it can extract the HTTP message contained in the TCP segment. Finally, it understands the HTTP protocol and so, for example, knows that the first bytes of an HTTP message will contain the string “GET,” “POST,” or “HEAD,” as shown in Figure 2.8 in the…
IP address: A 32-bit binary number, often written in the DDN format, that hosts use as their unique identifier in a TCP/IP network, much like a postal mailing address in the postal system.…
9. What numeric port range is commonly used by clients in a client -> server communication session? 0 to 1023…
TCP / IP Model - provides end-to-end connectivity specifying how data should be formatted, addressed, transmitted, routed and received at the destination. This functionality has been organized into four abstraction layers which are used to sort all related protocols according to the scope of networking involved.[1][2] From lowest to highest, the layers are the link layer, containing communication technologies for a single network segment (link), the internet layer, connecting hosts across independent networks, thus establishing internetworking.…
Deliverable 1 - A PDU (Protocol Data Unit) is an important term related to the initial four layers of the OSI model. In Layer 2 it contains the frame, in layer 3 it contains a packet, and in layer 4 it is a segment. Layer 5 contains the data. The PDU has four field’s destination access point, source service point, control field and information field. The source where Wireshark retrieved the data from was www.cnn.com…
Note: This study guild also include the material covered before midterm for completeness. You can focus on Chapter 4 and 5…
distinguish how many of each packet size was transmitted on your LAN segment? Why is this important…