Multiplexing
... – Longer messages split into series of packets. – Each packet contains a portion of user data plus some control information: Routing (addressing). • Packets are received, stored briefly (buffered) and passed on to the next node. – Store and forward. • Transmission time depends on the packet size. – ...
... – Longer messages split into series of packets. – Each packet contains a portion of user data plus some control information: Routing (addressing). • Packets are received, stored briefly (buffered) and passed on to the next node. – Store and forward. • Transmission time depends on the packet size. – ...
Computer Network
... LAN: This network is within a very limited area like an office building, a school, or a home. It is simpler and cheaper than other network. In a typical LAN there is a server which consist additional software and hardware. A LAN is useful for sharing resources like files, printers, games or other ap ...
... LAN: This network is within a very limited area like an office building, a school, or a home. It is simpler and cheaper than other network. In a typical LAN there is a server which consist additional software and hardware. A LAN is useful for sharing resources like files, printers, games or other ap ...
network
... Kbps to 45Mbps channel(or multiple smaller channels) 270 msec end-end delay geosynchronous versus low altitude ...
... Kbps to 45Mbps channel(or multiple smaller channels) 270 msec end-end delay geosynchronous versus low altitude ...
Exam Paper Stationery - University of East Anglia
... -54. (a)(i) The data link layer of the OSI seven layer reference model can employ forward error correction (FEC) or backward error correction (BEC) to reduce the effect of errors that occur in transmission. Explain the operation and differences between FEC and BEC and comment on their effectiveness ...
... -54. (a)(i) The data link layer of the OSI seven layer reference model can employ forward error correction (FEC) or backward error correction (BEC) to reduce the effect of errors that occur in transmission. Explain the operation and differences between FEC and BEC and comment on their effectiveness ...
IOSR Journal of Computer Engineering (IOSR-JCE) e-ISSN: 2278-0661,p-ISSN: 2278-8727 PP 37-41 www.iosrjournals.org
... In MANETs, intrusion prevention (IPS) and intrusion detection(IDS) techniques need to complement each other to guarantee a highly secureenvironment,such as encryption and authentication, are more useful inpreventing outside attacks. Once the node is compromised, intrusion preventionmeasures will hav ...
... In MANETs, intrusion prevention (IPS) and intrusion detection(IDS) techniques need to complement each other to guarantee a highly secureenvironment,such as encryption and authentication, are more useful inpreventing outside attacks. Once the node is compromised, intrusion preventionmeasures will hav ...
Using Argus Audit Trails to Enhance IDS Analysis
... • Long sessions are common on networks • Due to the more stateless nature of udp and icmp, distinct network flows might be collapsed into a single network flow • Long sessions to interesting ports, or inbound to unexpected locations, or with IDS alerts are the things we want to focus on • Extensive ...
... • Long sessions are common on networks • Due to the more stateless nature of udp and icmp, distinct network flows might be collapsed into a single network flow • Long sessions to interesting ports, or inbound to unexpected locations, or with IDS alerts are the things we want to focus on • Extensive ...
Internet Architecture
... - reservation/dedication (aka circuit-switching) and - no reservation (aka packet switching) ...
... - reservation/dedication (aka circuit-switching) and - no reservation (aka packet switching) ...
IP Packet Switching COS 461: Computer Networks Spring 2008 (MW 1:30‐2:50 in COS 105) Mike Freedman
... • Source establishes connecTon to desTnaTon – Node along the path store connecTon info – Nodes may reserve resources for the connecTon ...
... • Source establishes connecTon to desTnaTon – Node along the path store connecTon info – Nodes may reserve resources for the connecTon ...
NetworkPurposeTypesPackets
... WANs are often built using leased lines. A router connects to the LAN on one side and a hub within the WAN on the other Network protocols including TCP/IP deliver transport and addressing functions. ...
... WANs are often built using leased lines. A router connects to the LAN on one side and a hub within the WAN on the other Network protocols including TCP/IP deliver transport and addressing functions. ...
CS447_Spring2002_Rea..
... Suppose that a sender is sending data to a destination using frame-relay transmission. There are 15 intermediate routers between the sender and the receiver on the path between the sender and the destination. Assuming that sliding window flow control is used for the frame-relay transmission, calcula ...
... Suppose that a sender is sending data to a destination using frame-relay transmission. There are 15 intermediate routers between the sender and the receiver on the path between the sender and the destination. Assuming that sliding window flow control is used for the frame-relay transmission, calcula ...
Switching and Routing
... • Deadlock free routing example: – Up/down routing • Select a root node and build a spanning tree • Links are classified as up links or down links – Up links: from lower level to upper level – Down links: from upper level to lower level – Link between nodes in the same level: up/down based on node n ...
... • Deadlock free routing example: – Up/down routing • Select a root node and build a spanning tree • Links are classified as up links or down links – Up links: from lower level to upper level – Down links: from upper level to lower level – Link between nodes in the same level: up/down based on node n ...
Power of Layering
... • Allows arbitrary split between network & host part of address – Do not use classes to determine network ID – Use common part of address as network number – E.g., addresses 192.4.16 - 192.4.31 have the first 20 bits in common. Thus, we use these 20 bits as the network number 192.4.16/20 ...
... • Allows arbitrary split between network & host part of address – Do not use classes to determine network ID – Use common part of address as network number – E.g., addresses 192.4.16 - 192.4.31 have the first 20 bits in common. Thus, we use these 20 bits as the network number 192.4.16/20 ...
Optimizing Your Network Design
... • Alternative to IP type-of-service and precedence capabilities in the IP header • Supports more sophisticated mechanisms for QoS requirements for individual traffic flow • Deploy on LANs and intranets to support multimedia applications • QoS signaling protocols for delivering QoS requirements on a ...
... • Alternative to IP type-of-service and precedence capabilities in the IP header • Supports more sophisticated mechanisms for QoS requirements for individual traffic flow • Deploy on LANs and intranets to support multimedia applications • QoS signaling protocols for delivering QoS requirements on a ...
1st Lecture
... Each packet is passed through the network from node to node along some path (Routing) At each node the entire packet is received, stored briefly, and then forwarded to the next node (Store-and-Forward Networks) Typically no capacity is allocated for packets Spring 2004 ...
... Each packet is passed through the network from node to node along some path (Routing) At each node the entire packet is received, stored briefly, and then forwarded to the next node (Store-and-Forward Networks) Typically no capacity is allocated for packets Spring 2004 ...
MULTI-PROTOCOL LABEL SWITCHING
... Designed to provide a unified data-carrying service for both circuit-based clients and packet-switching. ...
... Designed to provide a unified data-carrying service for both circuit-based clients and packet-switching. ...
chapterw4
... – ATM layer • connection-oriented service that transmits fixed length packets called cells, avoid flow control and error checking at the switching, provide bandwidth and latency guarantees • VC (virtual channel): a logical unidirectional association between two endpoints of a link in the physical pa ...
... – ATM layer • connection-oriented service that transmits fixed length packets called cells, avoid flow control and error checking at the switching, provide bandwidth and latency guarantees • VC (virtual channel): a logical unidirectional association between two endpoints of a link in the physical pa ...
3rd Edition: Chapter 4
... The naming of switchers, routers, and bridges can be confusing. In general, a switch implies that some or all ports have dedicated circuits; a router can forward traffic from input to output following certain algorithms (similar to switch) where ports ...
... The naming of switchers, routers, and bridges can be confusing. In general, a switch implies that some or all ports have dedicated circuits; a router can forward traffic from input to output following certain algorithms (similar to switch) where ports ...
Lecture 4a: Communication and Networking
... End-to-end connections Segments and reassembles data in proper sequence Setup and teardown of “virtual circuits” (connection oriented) Can ensure segment delivery with error correction, recovery and flow control ...
... End-to-end connections Segments and reassembles data in proper sequence Setup and teardown of “virtual circuits” (connection oriented) Can ensure segment delivery with error correction, recovery and flow control ...
ppt
... - How does the Internet work? - What are the Internet’s design principles? - Where is the Internet heading to? ...
... - How does the Internet work? - What are the Internet’s design principles? - Where is the Internet heading to? ...
OSI Data Link Layer
... 2. There are more than one route between the source and destination, the network layer chooses the best route (next hop) based on some criteria. Examples ...
... 2. There are more than one route between the source and destination, the network layer chooses the best route (next hop) based on some criteria. Examples ...
Active Networks
... "Patrol" and "first-aid" packets can track a problem and rectify it respectively. Code moved to node rather than data to ...
... "Patrol" and "first-aid" packets can track a problem and rectify it respectively. Code moved to node rather than data to ...
Packet switching
Packet switching is a digital networking communications method that groups all transmitted data into suitably sized blocks, called packets, which are transmitted via a medium that may be shared by multiple simultaneous communication sessions. Packet switching increases network efficiency, robustness and enables technological convergence of many applications operating on the same network.Packets are composed of a header and payload. Information in the header is used by networking hardware to direct the packet to its destination where the payload is extracted and used by application software.Starting in the late 1950s, American computer scientist Paul Baran developed the concept Distributed Adaptive Message Block Switching with the goal to provide a fault-tolerant, efficient routing method for telecommunication messages as part of a research program at the RAND Corporation, funded by the US Department of Defense. This concept contrasted and contradicted the heretofore established principles of pre-allocation of network bandwidth, largely fortified by the development of telecommunications in the Bell System. The new concept found little resonance among network implementers until the independent work of Donald Davies at the National Physical Laboratory (United Kingdom) (NPL) in the late 1960s. Davies is credited with coining the modern name packet switching and inspiring numerous packet switching networks in Europe in the decade following, including the incorporation of the concept in the early ARPANET in the United States.