Security The big picture Some consequences Three types of threat
... • Very poor assumption to make when bad guys can control network! ...
... • Very poor assumption to make when bad guys can control network! ...
Firewalls
... datagrams with IP protocol field = 17 and with either source or dest port = 23. all incoming, outgoing UDP flows and telnet connections are blocked. example 2: Block inbound TCP segments with ...
... datagrams with IP protocol field = 17 and with either source or dest port = 23. all incoming, outgoing UDP flows and telnet connections are blocked. example 2: Block inbound TCP segments with ...
Ethernet Passive Optical Networks
... The communications industry is on the cusp of a revolution that will transform the landscape. This revolution is characterized by three fundamental drivers. First, deregulation has opened the local loop to competition, launching a whole new class of carriers that are spending billions to build out t ...
... The communications industry is on the cusp of a revolution that will transform the landscape. This revolution is characterized by three fundamental drivers. First, deregulation has opened the local loop to competition, launching a whole new class of carriers that are spending billions to build out t ...
TeleGuard 5GHz Point to Multipoint Radio Ethernet
... The TeleGuard® Point to Multipoint Radio Ethernet solution consists of a base station and customer premise equipment (CPE) units. The base stations are available as either modular or stand-alone micro cell units. CPEs are available in various models for differing bandwidth and single or multiple use ...
... The TeleGuard® Point to Multipoint Radio Ethernet solution consists of a base station and customer premise equipment (CPE) units. The base stations are available as either modular or stand-alone micro cell units. CPEs are available in various models for differing bandwidth and single or multiple use ...
Chapter 14
... cannot communicate with anyone until a circuit is set up. When you dial someone’s number, the complete transmission capacity of the telephone network is not dedicated to your call; instead, a connection is made between your telephone and the telephone of the person you are calling and a single circu ...
... cannot communicate with anyone until a circuit is set up. When you dial someone’s number, the complete transmission capacity of the telephone network is not dedicated to your call; instead, a connection is made between your telephone and the telephone of the person you are calling and a single circu ...
Net+ Chapter 1
... • Therefore, the TCP/IP protocol must be installed on the client computer. • You may or may not be required to manually configure your TCP/IP addressing parameters. If you are, the standard rules concerning address class, subnet mask, etc., must be followed. • The information must be entered correct ...
... • Therefore, the TCP/IP protocol must be installed on the client computer. • You may or may not be required to manually configure your TCP/IP addressing parameters. If you are, the standard rules concerning address class, subnet mask, etc., must be followed. • The information must be entered correct ...
01_NF_Ch09
... This jamming signal is used to notify the other devices of a collision, so that they will invoke a backoff algorithm. This backoff algorithm causes all devices to stop transmitting for a random amount of time, which allows the collision signals to subside. After the delay has expired on a device, th ...
... This jamming signal is used to notify the other devices of a collision, so that they will invoke a backoff algorithm. This backoff algorithm causes all devices to stop transmitting for a random amount of time, which allows the collision signals to subside. After the delay has expired on a device, th ...
10/100/1000 Mbps connectivity to workstations and servers and non
... With FastIron II switches, enterprises have a flexible, high performance solution that seamlessly interoperates with existing networks. Network managers can assign up to 4,096 VLANs on a port, station, protocol, sub-net and IEEE 802.1p/q tagged basis. Flexible support for such a large number of VLANs ...
... With FastIron II switches, enterprises have a flexible, high performance solution that seamlessly interoperates with existing networks. Network managers can assign up to 4,096 VLANs on a port, station, protocol, sub-net and IEEE 802.1p/q tagged basis. Flexible support for such a large number of VLANs ...
MAC Address - 6-byte sequence assigned to NIC by the
... OSI Model: Transport Layer 4. Transport Layer The transport layer is responsible for process-to-process delivery of entire message. While the network layer gets each packet to the correct computer, the transport layer gets the entire message to the correct process on that computer. ...
... OSI Model: Transport Layer 4. Transport Layer The transport layer is responsible for process-to-process delivery of entire message. While the network layer gets each packet to the correct computer, the transport layer gets the entire message to the correct process on that computer. ...
ppt - Course Website Directory
... IP and Underlying Networks • Most hosts are attached to a LAN by an interface board that only understands LAN addresses. For example, every Ethernet board is equipped with a globally unique 48-bit Ethernet address. • The boards send and receive frames based on 48bit Ethernet addresses. They know not ...
... IP and Underlying Networks • Most hosts are attached to a LAN by an interface board that only understands LAN addresses. For example, every Ethernet board is equipped with a globally unique 48-bit Ethernet address. • The boards send and receive frames based on 48bit Ethernet addresses. They know not ...
Data Link Layer
... • The main tasks of the data link layer are: • Transfer data from the network layer of one machine to the network layer of another machine using hop by hop transmission over single links (single segments). • Convert the raw bit stream of the physical layer into groups of bits (“frames”) and vice ver ...
... • The main tasks of the data link layer are: • Transfer data from the network layer of one machine to the network layer of another machine using hop by hop transmission over single links (single segments). • Convert the raw bit stream of the physical layer into groups of bits (“frames”) and vice ver ...
EDS-405A/408A-PN Series
... Description) v2, and SIMATIC STEP 7 device icons are available • Turbo Ring and Turbo Chain (recovery time < 20 ms @ 250 switches), and RSTP/STP for network redundancy ...
... Description) v2, and SIMATIC STEP 7 device icons are available • Turbo Ring and Turbo Chain (recovery time < 20 ms @ 250 switches), and RSTP/STP for network redundancy ...
computer network - model test paper
... packetized voice or video that do not have a constant data transmission speed but that do have requirements similar to constant bit rate services. AAL2 is suitable for VBR traffic. The AAL2 process uses 44 bytes of the cell payload for user data and reserves 4 bytes of the payload to support the AAL ...
... packetized voice or video that do not have a constant data transmission speed but that do have requirements similar to constant bit rate services. AAL2 is suitable for VBR traffic. The AAL2 process uses 44 bytes of the cell payload for user data and reserves 4 bytes of the payload to support the AAL ...
Cisco Voice Programs - In Search of a Strategy
... • Shared infrastructure - redundancy • Voice Processing is now economical – Voice compression algorithms give good quality at 8Kbps and DSPs have come down in price – Potential for reducing WAN costs integrating Voice and Data ...
... • Shared infrastructure - redundancy • Voice Processing is now economical – Voice compression algorithms give good quality at 8Kbps and DSPs have come down in price – Potential for reducing WAN costs integrating Voice and Data ...
pdf
... R creates link-layer frame with B's MAC address as dest, frame contains A-to-B IP datagram MAC src: 1A-23-F9-CD-06-9B MAC dest: 49-BD-D2-C7-56-2A IP src: 111.111.111.111 IP dest: 222.222.222.222 ...
... R creates link-layer frame with B's MAC address as dest, frame contains A-to-B IP datagram MAC src: 1A-23-F9-CD-06-9B MAC dest: 49-BD-D2-C7-56-2A IP src: 111.111.111.111 IP dest: 222.222.222.222 ...
CCNA Fast Track - K C Communications
... NOTE… Ethernet II/DIX frame preamble is 8 bytes long with no SD byte, Ethernet II/DIX frame has TYPE field and no LENGTH or 802.2 fields. Ethernet IEEE 802.3 frames have 7 byte preamble, 1 byte SD, Ethernet IEEE 802.3 frames have LENGTH field and no TYPE field, Ethernet IEEE 802.3 frames have 802.2 ...
... NOTE… Ethernet II/DIX frame preamble is 8 bytes long with no SD byte, Ethernet II/DIX frame has TYPE field and no LENGTH or 802.2 fields. Ethernet IEEE 802.3 frames have 7 byte preamble, 1 byte SD, Ethernet IEEE 802.3 frames have LENGTH field and no TYPE field, Ethernet IEEE 802.3 frames have 802.2 ...
presentationToddandAsh
... Network data represented in packets Packet sizes represented in bytes ...
... Network data represented in packets Packet sizes represented in bytes ...
Network Layer (4) - FSU Computer Science Department
... • The NAT box will convert the internal IP address to the real IP address of the company, and pass the packet to the gateway router. • When there is a packet destined for an internal machine arrived at the router, what should the router and NAT box do? • For IP packets carrying TCP or UDP, use port ...
... • The NAT box will convert the internal IP address to the real IP address of the company, and pass the packet to the gateway router. • When there is a packet destined for an internal machine arrived at the router, what should the router and NAT box do? • For IP packets carrying TCP or UDP, use port ...
Quality of Service
... depending on the traffic at the moment the packet is sent. There is no guarantee that the packets arrive at the destination in order. This model is not quite as simple as it looks. Some issues have to be considered such as: The multiprotocol routers can translate from packet format to another when t ...
... depending on the traffic at the moment the packet is sent. There is no guarantee that the packets arrive at the destination in order. This model is not quite as simple as it looks. Some issues have to be considered such as: The multiprotocol routers can translate from packet format to another when t ...
presentation source
... of TCP than seeing it come alive. Not looking at high level behavior, but actually watching packets fly across the wire • Different stacks have different personalities • TCP/IP Illustrated v1 is great to learn how 25 ...
... of TCP than seeing it come alive. Not looking at high level behavior, but actually watching packets fly across the wire • Different stacks have different personalities • TCP/IP Illustrated v1 is great to learn how 25 ...
Huawei S1700 Switch Data Sheet
... The S1700 supports Energy Efficient Ethernet (EEE), which enables the switch to enter a powersaving mode when traffic is light. The S1700 can adjust the power output for transmissions based on the cable length. It can also set any ports that are not transmitting traffic to sleep mode. ...
... The S1700 supports Energy Efficient Ethernet (EEE), which enables the switch to enter a powersaving mode when traffic is light. The S1700 can adjust the power output for transmissions based on the cable length. It can also set any ports that are not transmitting traffic to sleep mode. ...
Document
... A user calls up the network admin, saying their network connection is down For most non-technical users, even this clear of a statement of the problem might not be possible A network admin will eventually figure at least this much out from the user’s comments ...
... A user calls up the network admin, saying their network connection is down For most non-technical users, even this clear of a statement of the problem might not be possible A network admin will eventually figure at least this much out from the user’s comments ...
DSL Versus Cable Internet
... DSL is as safe and as connected to the Internet, you secure as traditional may end up with a unchanging IP address .Traditional dial-up dial-up modem services randomly assign you ...
... DSL is as safe and as connected to the Internet, you secure as traditional may end up with a unchanging IP address .Traditional dial-up dial-up modem services randomly assign you ...
NAME: Computer Science 461 Midterm Exam March 30, 2009
... 1D. [4 points] In the previous example of 1c, would anything be different if all packets were lost after you reached 32,000 bytes per second, instead of just a single packet? If so, what is the next instantaneous rate TCP will send at in this example, and how long (in terms of RTTs) would it now tak ...
... 1D. [4 points] In the previous example of 1c, would anything be different if all packets were lost after you reached 32,000 bytes per second, instead of just a single packet? If so, what is the next instantaneous rate TCP will send at in this example, and how long (in terms of RTTs) would it now tak ...