Which of these devices can not only manage traffic between local PCs in a network but can also access outside networks? network adapter
switch
router
repeater

Switches generally have a more intelligent role than hubs. A switch is a multiport device that improves network efficiency. The switch maintains limited routing information about nodes in the internal network, and it allows connections to systems like hubs or routers. Strands of LANs are usually connected using switches. Generally, switches can read the hardware addresses of incoming packets to transmit them to the appropriate destination.

Explanation:

Routers are an essential part of any larger TCP/IP network. In fact, without the development of network routers and TCP/IP routing protocols, the Internet (the biggest network in the world) would not have become as extensive. Routers play a vital role in controlling traffic and keeping the network efficient.

answer; histogram;

answer; insolated i/o uses separate memory space,and on the other hand memory mapped i/o uses memory from the main