5. (15 pt.) Suppose that a 100-KB file is transmitted in the form of 1-KB packets back-to-back from one host to another through 3 switches, and no overhead of encapsulation. Each link works at 1 Gbps and introduces 2-uis propagation delay, and neither nodal processing nor queueing delay considered. Calculate end-to-end file transmission delay (from first bit sent to last bit received) for the following: (a) Switches are all of store-and-forward type; (b) Switches are all of cut-through type, i.e., able to forward a packet once the first 160 bits have been received. 5. (15 pt.) Suppose that a 100-KB file is transmitted in the form of 1-KB packets back-to-back from one host to another through 3 switches, and no overhead of encapsulation. Each link works at 1 Gbps and introduces 2-uis propagation delay, and neither nodal processing nor queueing delay considered. Calculate end-to-end file transmission delay (from first bit sent to last bit received) for the following: (a) Switches are all of store-and-forward type; (b) Switches are all of cut-through type, i.e., able to forward a packet once the first 160 bits have been received