Ethernet is used on every single network in the world and is not going away. It's critical to understand how Ethernet is used as well as the different cabling types used between devices. This introducton to Ethernet by Cisco industry expert Todd Lammle will provide the insight you need to understand this full series on the CCENT objectives.
- Ethernet is a land technology that pretty much every network runs today. The speeds are from 10 megabits all the way up to 100 gigabits a second. Ethernet is the system we use to connect computer systems to form a local area network. The Ethernet term, Collision Domain, refers to a networks scenario. Wherein, one device sends a frame out on a physical network, forcing every other device on the same segment to pay attention to it. This can cause a lot of extra traffic, slowing down every systems connection in the domain.
We can break up collision domains with a switch. Each port on a switch is a single collision domain. This decreases traffic, freeing up band width for users. Which is a great start! But switches don't break up broadcast domains by default, so this is still only one broadcast domain, which is not so good. Segmenting broadcast domains is one of the benefits routers offer. On a router, each port is its own broadcast domain. In this network, there are two router interfaces providing two broadcast domains.
I count 10 switch segments, meaning we've got 10 collision domains. Each switch port is capable of running in full duplex mode, meaning it can transmit and receive traffic simultaneously. When a host wants to transmit over the network, it first checks for the presence of a digital signal on the wire. If all is clear and no other host is transmitting, the host will then proceed with its transmission. If the host attacks another signal on the wire, it sends out an extended jam signal that causes all nodes on the segment to stop sending data, like a busy signal.
Back off algorithms determine when the colliding stations can retransmit. If collisions keep occurring after 15 tries, the nodes attempting to transmit will eventually time out. Half duplex means the connection is either transmitting or receiving at any one time. Defined in the original IEEE802.3 Ethernet specification. Half duplex also uses the Carrier Sense Multiple Access with Collision Detect protocol to help prevent collisions and to permit retransmitting if one occurs.
If a Hub is attached to a switch, it must operate in half duplex mode, because the end stations must be able to detect collisions.
Author
Released
9/30/2016For more information on the CCENT exam, visit Cisco's website.
- Overview of internetworking
- Ethernet
- The TCP/IP networking model
- Easy subnetting
- VLSM
- Managing Cisco IOS
- Managing Cisco networks and devices
- IP routing
- Layer 2 switching
- VLANs and InterVLAN routing
- Security
- Network address translation
- IPv6
Skill Level Intermediate
Duration
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Introduction
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Welcome54s
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The CCNA exam58s
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Lab environment overview1m 3s
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1. Internetworking
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Internetworking devices4m 20s
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2. Ethernet
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Ethernet overview2m 23s
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Ethernet addressing3m 51s
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Ethernet cables4m 55s
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3. Introduction to TCP/IP
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Overview of TCP/IP model2m 40s
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Application/process layer2m 19s
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Internet layer3m 37s
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IP addressing4m 33s
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4. Easy Subnetting
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Subnet basics1m 28s
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Subnet block sizing5m 25s
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Subnet by example5m 6s
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Class B subnetting3m 53s
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5. VLSM, Summarization, and Troubleshooting TCP/IP
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VLSM2m 38s
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VLSM by hand6m 28s
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6. Cisco Internetworking Operating System (IOS)
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Basic CLI commands5m 23s
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Telnet and SSH5m 4s
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Router and switch components2m 27s
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Configure DHCP3m 48s
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8. IP Routing
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Overview of IP routing3m 45s
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The IP routing process3m 50s
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Configure IP routing6m 41s
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Static routing5m 28s
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Default routing5m 36s
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Configure RIPv26m 52s
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Verify RIPv2 routing5m 55s
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9. Layer 2 Switching
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Configure a Catalyst switch7m 33s
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10. VLANs and InterVLAN Routing (IVR)
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Overview of VLANs3m 2s
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Configure VLANs3m 8s
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Configure trunk links5m 15s
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11. Security
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Configure access lists4m 3s
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Introduction to NAT2m 18s
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Static NAT2m 53s
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Configure static NAT3m 11s
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Dynamic NAT2m 44s
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Configure dynamic NAT3m 44s
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NAT overload (PAT)3m 56s
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Configure NAT overload5m 26s
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13. IPv6
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Introduction to IPv62m 22s
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Overview of ICMPv62m 55s
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Configure IPv66m 7s
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Conclusion
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Next steps51s
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Video: Ethernet overview