Join Greg Sowell for an in-depth discussion in this video Static vs. dynamic routing, part of Foundations of Networking: Network Media (WANs).
- A router makes all of its forwarding decisions…based on its routing table.…A router is really a useless device…unless it has a populated route table.…It must have a destination for every packet.…Otherwise it will simply discard it.…As a packet enters a router…it will first examine the destination address.…If the packet is addressed to the router itself,…it will forward the packet to its data plane.…If the packet is not destined for the router itself,…it will decrement the packet's time to live, or TTL, by one.…
TTL is a calendar that puts a maximum…on the number of routes a packet can traverse.…Loops can occur at layer three, too.…If router A sends a packet to router B…and router B sends it back,…we have a loop.…TTL prevents this by setting a maximum number…of times this can happen.…If the router decrements the TTL to zero,…the packet will be dropped…and an ICMP message will be sent…to the originating host.…If the TTL is one or greater,…it will then reference the routing table.…
While this doesn't technically fix the loop,…
He discusses different WAN technologies and features such as speeds, spans, and price points—including inexpensive options such as VPN. He then covers switches (the devices that connect computers in your building) and routers (devices that control the transmission of network data). Along the way, Greg shows how to build private connections, implement free networking over the Internet, build switch networks, and overlay-routed networks. He'll also introduce different routing protocols, such as OPSF link-state routing and distance-vector routing with RIPv2, EIGRP, and BGP.
Note that this course maps to domains 1 and 2 of the Microsoft Technology Associate (MTA) Networking Fundamentals certification exam (98-366).
- Understanding the technology: from dial-up to VPNs
- Working with hubs, bridges, and switches
- Ensuring hardware redundancy
- Using switching types and MAC tables
- Preventing bridge loops with STP
- Routing with routing tables
- Using NAT
- Securing your switches and routers
- Setting up firewalls
- Working with different routing protocols: RIPv2, OSPF, EIGRP, and more
Skill Level Beginner
Foundations of Networking: Network Media (LANs)with Greg Sowell1h 7m Intermediate
1. WAN Technologies
4. Routing Protocols
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