Cisco BPA questions with correct answers

What is the OSI model? - Answer The OSI model is a seven layer reference model used for networking protocols What are the layers of the OSI model? - Answer Physical, Data Link, Network, Transport, Session, Presentation, Application What are the layers of the DOD model? - Answer Network Access - L1 Internet - L2 Transport -L3 Application -L4 Internet Protocol - Answer A layer 3 protocol commonly used to forward packets to their inteded destination ICMP - Answer A layer 3 protocol commonly used to test reachability to remote network device and it is used to report error conditions in a network Router - Answer A layer 3 network device that can make packet forwarding decisons based on logical addresses Ping - Answer A utility commonly used to determine if one network devices can reach another network device