Intrusion detection systems
... Port scanning, in which packets are sent to a host to gain information about it based on its response Packet sniffing, in which every packet on the network has its header and data examined ...
... Port scanning, in which packets are sent to a host to gain information about it based on its response Packet sniffing, in which every packet on the network has its header and data examined ...
Introduction to computer networkd #8
... A simple transport protocol might use the following principle: send a packet and then wait for an acknowledgment from the receiver before sending the next packet. If the ACK is not received within a certain amount of time, retransmit the packet. ...
... A simple transport protocol might use the following principle: send a packet and then wait for an acknowledgment from the receiver before sending the next packet. If the ACK is not received within a certain amount of time, retransmit the packet. ...
Optimal choice of the buffer size in the Internet routers
... congestion when packets spend a non-negligible time waiting in the router buffers to be transmitted over the next hop. TCP protocol tries to adjust the sending rate of a source to match the available bandwidth along the path. During the principle Congestion Avoidance phase TCP uses Additive Increase ...
... congestion when packets spend a non-negligible time waiting in the router buffers to be transmitted over the next hop. TCP protocol tries to adjust the sending rate of a source to match the available bandwidth along the path. During the principle Congestion Avoidance phase TCP uses Additive Increase ...
Internet History and Architecture
... Similarly, special features of lower layers cannot be exploited because of the minimal interface. The performance characteristics of the end-toend virtual link can vary wildly. IP solution vs Bridges: Bridges provide only a single level of forwarding and depend upon flat addresses. This means th ...
... Similarly, special features of lower layers cannot be exploited because of the minimal interface. The performance characteristics of the end-toend virtual link can vary wildly. IP solution vs Bridges: Bridges provide only a single level of forwarding and depend upon flat addresses. This means th ...
William Stallings Data and Computer Communications
... Set of routers and networks managed by signle organization A connected network There is at least one route between any pair of nodes ...
... Set of routers and networks managed by signle organization A connected network There is at least one route between any pair of nodes ...
Lecture 1: Course Introduction and Overview
... Reliable Message Delivery: the Problem • All physical networks can garble and/or drop packets – Physical media: packet not transmitted/received ...
... Reliable Message Delivery: the Problem • All physical networks can garble and/or drop packets – Physical media: packet not transmitted/received ...
The OSI and TCPIP Models
... It allows communication across networks of the same and different types and carries out translations to deal with dissimilar data addressing schemes. IP (Internet Protocol) and ARP (Address Resolution Protocol) are both to be found at the Internet layer. ...
... It allows communication across networks of the same and different types and carries out translations to deal with dissimilar data addressing schemes. IP (Internet Protocol) and ARP (Address Resolution Protocol) are both to be found at the Internet layer. ...
IPv6-Node-Address
... Establish the rules and formats that are followed for communication between networks and nodes Format data into packets Media access method sends packets ...
... Establish the rules and formats that are followed for communication between networks and nodes Format data into packets Media access method sends packets ...
CSCI6268L20
... – If something is dropped… oh well – If one fragment is dropped, many transport layer protocols (like TCP) will consider the whole thing lost and not ACK – This seems bad, but it’s one of the biggest successes of IP – UDP is IP with ports, so it too is “best effort” ...
... – If something is dropped… oh well – If one fragment is dropped, many transport layer protocols (like TCP) will consider the whole thing lost and not ACK – This seems bad, but it’s one of the biggest successes of IP – UDP is IP with ports, so it too is “best effort” ...
PPT
... • Sequence numbers detect packet sequencing problems: • duplicate: ignore • reordered: reorder or drop • lost: retransmit • Lost packets detected by sender. • uses time out to detect lack of acknowledgment • requires reliable roundtrip time estimate • Retransmission requires that sender keeps copy o ...
... • Sequence numbers detect packet sequencing problems: • duplicate: ignore • reordered: reorder or drop • lost: retransmit • Lost packets detected by sender. • uses time out to detect lack of acknowledgment • requires reliable roundtrip time estimate • Retransmission requires that sender keeps copy o ...
Document
... be >> MSS/RTT When connection begins, increase rate exponentially fast until first loss event initial rate is slow but ramps up exponentially fast ...
... be >> MSS/RTT When connection begins, increase rate exponentially fast until first loss event initial rate is slow but ramps up exponentially fast ...
Review of Important Networking Concepts TCP/IP Introductory
... In this case, each computer is connected to only one link and therefore has only one pair of addresses. Each router, however, is connected to three networks (only two are shown in the figure). So each router has three pairs of addresses, one for each connection. Note. The physical addresses will cha ...
... In this case, each computer is connected to only one link and therefore has only one pair of addresses. Each router, however, is connected to three networks (only two are shown in the figure). So each router has three pairs of addresses, one for each connection. Note. The physical addresses will cha ...
Chapter 3 - Professor Dan Web
... UDP: User Datagram Protocol [RFC 768] “no frills,” “bare bones” ...
... UDP: User Datagram Protocol [RFC 768] “no frills,” “bare bones” ...
Transport Layer
... UDP: User Datagram Protocol [RFC 768] • “no frills,” “bare bones” Internet transport protocol • “best effort” service, UDP segments may be: – lost – delivered out of order to app • connectionless: – no handshaking between UDP sender, receiver – each UDP segment handled independently of others ...
... UDP: User Datagram Protocol [RFC 768] • “no frills,” “bare bones” Internet transport protocol • “best effort” service, UDP segments may be: – lost – delivered out of order to app • connectionless: – no handshaking between UDP sender, receiver – each UDP segment handled independently of others ...
Part I: Introduction
... prevent illegal modification/access of internal data e.g., attacker replaces CIA’s homepage with something else allow only authorized access to inside network set of authenticated users/hosts three types of firewalls: stateless packet filters stateful packet filters application gateways Ne ...
... prevent illegal modification/access of internal data e.g., attacker replaces CIA’s homepage with something else allow only authorized access to inside network set of authenticated users/hosts three types of firewalls: stateless packet filters stateful packet filters application gateways Ne ...
ppt - Carnegie Mellon School of Computer Science
... » The hardware/software of communicating parties are often not built by the same vendor » Yet they can communicate because they use the same protocol ...
... » The hardware/software of communicating parties are often not built by the same vendor » Yet they can communicate because they use the same protocol ...
Application Control
... • Monitors inbound traffic • Inspects single packets only, not full stream or TCP/IP sequence • System alerts on 31 malicous packets; most common operating system fingerprinting attempts (nmap, CyberCop), port scans and network worms • Database selected carefully to avoid false positives • Patterns ...
... • Monitors inbound traffic • Inspects single packets only, not full stream or TCP/IP sequence • System alerts on 31 malicous packets; most common operating system fingerprinting attempts (nmap, CyberCop), port scans and network worms • Database selected carefully to avoid false positives • Patterns ...
