Unit 1: Network Infrastructure
This will allow you to demonstrate your networking skills, knowledge, and abilities, with a focus on enterprise-level switching, routing, and multicast components that support cross-platform (inter)operability and integration with the most recent software-defined technologies.
One quick way to see which hosts will reply to an ICMP Echo is to send a ping to 255.255.255.255 on an Ethernet network.
A DR and a BDR will be chosen by OSPF routers on a broadcast network. The following packets are sent via multicast to the address 224.0.0.5 of the All SPF Routers:
- Hello packets
- Every packet was sent out by the BDR and DR.
The multicast address 224.0.0.6 (MAC 0100.5E00.0006) is the destination for each and every packet that is transmitted by the DRothers.
The DR is responsible for abstracting the multi-access network that lies behind it. For the purpose of representing the network as a pseudonode, the DR is responsible for issuing a single Type 2 Network LSA from the network. Considering that the network does not possess a means by which it can represent itself, the burden of issuing the LSA falls on the shoulders of the DR. While the alternative would be for each connected OSPF router to generate its own Network LSA, this saves resources because it eliminates the need for that. In addition to its role as a representation of the network, the LSA is also employed for the purpose of indicating the current state of database synchronization on the network. The Network LSA contains a listing of each and every OSPF router that has a database that is already synced with the DR.
. A representation of the router interface for the DR can still be found in the Router LSA for the DR.
