Lecture #22: Link layer (ethernet, switches)
... link-layer device: smarter than hubs, take active role store, forward Ethernet frames examine incoming frame’s MAC address, selectively forward frame to one-or-more outgoing links when frame is to be forwarded on segment, uses CSMA/CD to access segment transparent hosts are unaware of pres ...
... link-layer device: smarter than hubs, take active role store, forward Ethernet frames examine incoming frame’s MAC address, selectively forward frame to one-or-more outgoing links when frame is to be forwarded on segment, uses CSMA/CD to access segment transparent hosts are unaware of pres ...
Network Layer
... link layer sends datagram to 223.1.2.2 inside link-layer frame via interface 223.1.2.9 datagram arrives at ...
... link layer sends datagram to 223.1.2.2 inside link-layer frame via interface 223.1.2.9 datagram arrives at ...
Some of the forces driving WLAN (re)design
... Consumer devices in the enterprise • Consumer devices on a home network • Reference model is a small L2 network i. ...
... Consumer devices in the enterprise • Consumer devices on a home network • Reference model is a small L2 network i. ...
DCN-Lecture-4 - WordPress.com
... Service Point Address (more often called a port) used to track multiple sessions between the same systems. SPA’s are used to allow a node to offer more than one service (i.e. it could offer both mail and web services) This layer is why you have to specify TCP or UDP when dealing with TCP/IP ...
... Service Point Address (more often called a port) used to track multiple sessions between the same systems. SPA’s are used to allow a node to offer more than one service (i.e. it could offer both mail and web services) This layer is why you have to specify TCP or UDP when dealing with TCP/IP ...
Chapter 1
... • High link utilization (often 100 percent). • High switch backplane utilization. • Hot Standby, Router Protocol, Duplicate IP Address Syslog messages indicate packet looping. • Syslog messages that indicate constant address relearning or MAC address flapping messages. CCNA4-29 ...
... • High link utilization (often 100 percent). • High switch backplane utilization. • Hot Standby, Router Protocol, Duplicate IP Address Syslog messages indicate packet looping. • Syslog messages that indicate constant address relearning or MAC address flapping messages. CCNA4-29 ...
Digital Business Networks Networking Models: OSI and TCP/IP 2.1
... between a user application and the protocol(s) it may use, (2) ensuring that necessary resources required by an application service are available, and (3) ________. A) making sure that end users are receptive B) making sure that the application is licensed C) making sure that email is properly set u ...
... between a user application and the protocol(s) it may use, (2) ensuring that necessary resources required by an application service are available, and (3) ________. A) making sure that end users are receptive B) making sure that the application is licensed C) making sure that email is properly set u ...
Lesson 2-3: Ethernet Basics
... To better understand CSMA/CD, think about trying to make a telephone call. Many of us have more than one telephone in our homes (a telephone network). When you pick up the telephone to make a call, you “sense” a dial tone or someone else on the line. If there is a dial tone, you proceed with your ca ...
... To better understand CSMA/CD, think about trying to make a telephone call. Many of us have more than one telephone in our homes (a telephone network). When you pick up the telephone to make a call, you “sense” a dial tone or someone else on the line. If there is a dial tone, you proceed with your ca ...
Linux+ Guide to Linux Certification
... Enabling development of software and hardware with common interfaces – Making worldwide networks possible; e.g., the Internet ...
... Enabling development of software and hardware with common interfaces – Making worldwide networks possible; e.g., the Internet ...
Lecture 1
... Data communication is the transfer of data from one device to another via some form of transmission medium. A data communications system must transmit data to the correct destination in an accurate and timely manner. The five components that make up a data communications system are the message, send ...
... Data communication is the transfer of data from one device to another via some form of transmission medium. A data communications system must transmit data to the correct destination in an accurate and timely manner. The five components that make up a data communications system are the message, send ...
Spacecraft Onboard Interface Systems—Low Data
... best option(s) available for interoperable wireless communications in the support of spacecraft monitoring and control applications. The specification of a Recommended Practice facilitates interoperable communications and forms the foundation for cross-support of communication systems between separa ...
... best option(s) available for interoperable wireless communications in the support of spacecraft monitoring and control applications. The specification of a Recommended Practice facilitates interoperable communications and forms the foundation for cross-support of communication systems between separa ...
(Seven Layers of Open Systems Interconnection (OSI
... called the Physical layer. Physical circuits are created on the physical layer of Open Systems Interconnection (OSI) model. Physical layers describe the electrical or optical signals used for communication. Physical layer of the Open Systems Interconnection (OSI) model is only concerned with the phy ...
... called the Physical layer. Physical circuits are created on the physical layer of Open Systems Interconnection (OSI) model. Physical layers describe the electrical or optical signals used for communication. Physical layer of the Open Systems Interconnection (OSI) model is only concerned with the phy ...
Routing algorithms
... Multiple same-cost paths allowed (only one path in RIP) For each link, multiple cost metrics for different TOS (e.g., satellite link cost set “low” for best effort; high for real time) Integrated uni- and multicast support: Multicast OSPF (MOSPF) uses same topology data base as OSPF Hierarchical O ...
... Multiple same-cost paths allowed (only one path in RIP) For each link, multiple cost metrics for different TOS (e.g., satellite link cost set “low” for best effort; high for real time) Integrated uni- and multicast support: Multicast OSPF (MOSPF) uses same topology data base as OSPF Hierarchical O ...
MQ3624532158
... as opposed to maintaining a complete list of routes as in the DSDV algorithm. When a source node wants to send a packet to some destination node and does not have a valid route to that destination, it initiates a path discovery process to locate the destination. It broadcasts a RREQ (Route Request) ...
... as opposed to maintaining a complete list of routes as in the DSDV algorithm. When a source node wants to send a packet to some destination node and does not have a valid route to that destination, it initiates a path discovery process to locate the destination. It broadcasts a RREQ (Route Request) ...
Lecture 6 - Aerobic Suspended Growth
... The first idea of sharing common channel with many active users was ALOHA network 1970 by Norman Abramson. Any host simply sends at will. If acknowledgement doesn’t come back within round trip time it resends it again after some random time. Bob Metcalfe and David Boggs 1976 used the same concept in ...
... The first idea of sharing common channel with many active users was ALOHA network 1970 by Norman Abramson. Any host simply sends at will. If acknowledgement doesn’t come back within round trip time it resends it again after some random time. Bob Metcalfe and David Boggs 1976 used the same concept in ...
lec6-L2-LAN
... Routers vs. Bridges Bridges + and + Bridge operation is simpler requiring less packet processing + Bridge tables are self learning - All traffic confined to spanning tree, even when alternative bandwidth is available - Bridges do not offer protection from broadcast storms ...
... Routers vs. Bridges Bridges + and + Bridge operation is simpler requiring less packet processing + Bridge tables are self learning - All traffic confined to spanning tree, even when alternative bandwidth is available - Bridges do not offer protection from broadcast storms ...
Introduction to Routing
... OSI & TCP/IP. In this course we are mainly interested in one particular layer – the network layer, which is also divided into two approaches: ...
... OSI & TCP/IP. In this course we are mainly interested in one particular layer – the network layer, which is also divided into two approaches: ...
CCNA testout unit 2
... Regardless of the method used, changes in routing information take time to propagate to all routers on the network. The term convergence is used to describe the condition when all routers have the same (or correct) routing information. Routers provide more functionality than either switches or bridg ...
... Regardless of the method used, changes in routing information take time to propagate to all routers on the network. The term convergence is used to describe the condition when all routers have the same (or correct) routing information. Routers provide more functionality than either switches or bridg ...
Lecture03
... integrated uni- and multicast support: Multicast OSPF (MOSPF) uses same topology data ...
... integrated uni- and multicast support: Multicast OSPF (MOSPF) uses same topology data ...
Chapter 6
... • PING is one of the most useful network tools available because it tests the most basic function of an IP network • Traceroute was originally developed for the Unix operating system but is used for many operating systems and most routers • It is used to track the path a packet takes to get to its d ...
... • PING is one of the most useful network tools available because it tests the most basic function of an IP network • Traceroute was originally developed for the Unix operating system but is used for many operating systems and most routers • It is used to track the path a packet takes to get to its d ...
Introducing Networks
... • Industry experts find it difficult to date the precise origin of networking – Because many devices have been networked throughout history ...
... • Industry experts find it difficult to date the precise origin of networking – Because many devices have been networked throughout history ...
3rd Edition: Chapter 4 - Computer and Information Science
... All hosts are to accept and respond to the broadcast address. This makes special services possible. ...
... All hosts are to accept and respond to the broadcast address. This makes special services possible. ...
Week6LectureNote
... • The network portion of the address is the same for all hosts on the network. • Each device is identified by a unique host portion. • This hierarchy means that routers only need to know the network portion – not the address of each individual host. CCNA1-30 ...
... • The network portion of the address is the same for all hosts on the network. • Each device is identified by a unique host portion. • This hierarchy means that routers only need to know the network portion – not the address of each individual host. CCNA1-30 ...
Chapter2R - Radford University
... unique Medium Access Control (MAC) or physical address First 24 bits identify NIC manufacturer; second 24 bits are ...
... unique Medium Access Control (MAC) or physical address First 24 bits identify NIC manufacturer; second 24 bits are ...