Hybrid networking and the underlying technologies that are used were the focus of this chapter. We covered the basics of the two lower layers of the OSI model. You learned about the optical connections at layer 1, and for layer 2 we covered link aggregation, VLANs, and jumbo frames.
There are several different types of encapsulation protocols that are used to create virtualized networks and separation over a common network fabric. You learned the difference between overlay and underlay networks and how they are integrated to create a modern networking architecture.
Next, we covered routing, and you learned about static and dynamic routing and the differences between the two approaches to populating the routing table. Static routing is used for basic networks that seldom change, while dynamic routing is more common in enterprise and service provider networks due to the changing network topologies and the need to automatically update the routing tables without human intervention.
When two different organizations interconnect and exchange routing information, the BGP protocol is used. You learned what BGP is and how it operates.
Hybrid network interconnects with AWS use either the Direct Connect, or DX, service or a site-to-site VPN connection. You were introduced to these architectures, and we will go deeper into them in Chapters 7 and 8.
Be able to identify and know the use cases of the lower two layers of the OSI model. Know the different types of optical SFP interfaces and fiber types, as well as the types of optical cables such as single and multimode. Understand 802.1Q VLANs specifically and the other encapsulation types such as VxLAN generally. Be familiar with what jumbo frames are and why they are used. Also, understand link aggregation as it is used extensively in AWS Direct Connect environments.
Know the two main methods of populating a route table. Route tables can be updated either statically or dynamically. Know that the static method hard-codes the routes and does not exchange any routing information with other devices on the network. Dynamic routing runs different types of routing protocols such as OSPF or BGP that allow for the routers to automatically update each other with changes in the network.
Understand the BGP routing protocol. While the exam is not about routing protocol theory, you are expected to know how BGP operates in relation to interconnecting your on-premise network with AWS.
Understand the basic architectures of hybrid networking and Direct Connect. Know the terminology, interface types, capabilities, and different architectures available such as DX and VPNs.
Know the difference between an overlay and underlay network. The underlay network is the underlying hardware of switches and routers that form the switching fabric of the network. Overlays are virtualized networks that operate over the underlay using protocols such as VxLAN to create many independent virtual networks such as VPCs in AWS.
Acedexam Training Policies
Learning resources
Other resources
Our Training Providers
