Final answer:
An Intrusion Detection System (IDS) can identify suspicious network traffic. Internet Gateway can also block suspicious traffic. Encryption, while not identifying suspicious traffic, can protect data during transmission.
Step-by-step explanation:
The Intrusion Detection System (IDS) is the technology that can identify suspicious network traffic entering your network. IDS monitors network traffic for any malicious activity or abnormal behavior and alerts network administrators if any threats are detected. It can analyze network packets, examine patterns, and compare them against known attack signatures to identify suspicious activity.
Another option, the Internet Gateway, acts as a point of entry for network traffic coming from the internet. It can provide firewall functionality to block incoming traffic that exhibits suspicious behavior or matches certain predefined criteria.
Encryption is a security measure that can be used to protect data during transmission over a network. While it doesn't directly identify suspicious network traffic, it ensures that the information transferred remains confidential and cannot be easily intercepted or tampered with.