A Firewall is required at the network edge to inspect all incoming Internet traffic, satisfying the security requirement. A Router is then used to handle traffic between the internal network and the firewall.

Inside Building A, a Switch is the appropriate device to connect desktops. Unlike a hub, a switch intelligently forwards traffic only to the specific destination port, preventing other devices on the network from seeing that traffic.

To connect Building B wirelessly, a Wireless Access Point (WAP) is placed in Building A. A Wireless range extender in Building B receives this signal and provides access to local wireless devices. For the extender to connect to the WAP, the SSID, security mode, and security key must match. The simulation shows a mismatched Key or Passphrase, which must be corrected.

Kurose, J. F., & Ross, K. W. (2021). Computer Networking: A Top-Down Approach (8th ed.). Pearson.

Firewalls: Section 8.6, "Network Security," describes firewalls as devices that filter packet traffic at the network perimeter (p. 718).

Switches: Section 6.3, "Link-Layer Switches," explains that switches forward frames selectively to output ports based on MAC addresses, thus isolating traffic between ports (p. 518).

WAP Association: Section 7.3.3, "Associating with an AP," details that a wireless host must configure its network parameters, including the SSID and passphrase, to match the AP's configuration to associate with it (p. 605).

IEEE Std 802.11™-2020. (2020). IEEE Standard for Information Technology—Telecommunications and information exchange between systems Local and metropolitan area networks—Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications.

Authentication: Section 12.3, "Authentication and association," specifies the procedures for a station to connect to an access point, which involves authenticating with shared credentials such as a Pre-Shared Key (PSK) for WPA2.

Lowe, D. (2018). Networking All-in-One For Dummies (7th ed.). John Wiley & Sons.

Range Extenders: Chapter 7, "Extending Your Network," explains that a wireless extender (or repeater) connects to an existing access point and rebroadcasts its signal, and for it to work, "the SSID, channel, and security settings on the repeater must be configured to match the settings on the main access point" (p. 581).