The Telecommunications and Network Security domain is one of the larger CISSP domains. Individuals actively involved in the networking end of the business may consider this one of the easier domains. However, it’s advisable not to be lulled into complacency, because this domain encompasses a large body of knowledge. It’s possible that many test questions may come from this domain. The following list gives you some key areas from telecommunications and network security you need to be aware of for the CISSP exam:
OSI/DoD TCP/IP model
Hardware: Routers/switches/hubs ...