computer networks

please answer the following questions:

QUESTION 12 In the packet switching model, packets may experience random queuing delays at the intermediate routers. QUESTION 13 In the TCP/IP model, NL uses a address to identify a node in a LAN. Your answer must be an acronym. Layer is responsible for the delivery of PDUs from a node to its adjacent node. Your answer must be a number. QUESTION 4 In the TCPIIP model, delivering a packet from one node to the adjacent node is the responsibility of the layer