F () The network portion of an IP address is the same for all the hosts in a subnet. T () Different ASes could use different intra-AS routing algorithms. F () In distance-vector routing algorithm, each node has a map of the entire network and determines the shortest path from itself to all other nodes in the network. T () In BGP, destinations are either hosts or Carried prefixes of a subnet or a collection of subnets. F () Hub, switch and router are all store-and-forward devices. T () The entries in a switch table is built automatically without any intervention from a network administrator. F () Consider a router with multiple ARP tables, one for each of its interfaces. No two of these ARP tables can contain the same LAN address. ? F () Pure Aloha can achieve higher efficiency than Slotted Aloha. F () In CDMA, the chipping rate is typically the same as the original data rate. T () Consider indirect routing for mobility management. The care-of-address of the mobile node can be always hidden from the correspondent. F () In order to protect message integrity. Message Authentication Codes (MAC) can be used, which adopts public-key cryptography