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how to check cisco certification.The Tor egress node is essentially the last-hop Tor node or "gateway" for Tor-encrypted traffic to be "sent" to the Internet. The Tor exit node can be used as a target for monitoring Tor traffic. Many organizations do not allow traffic from Tor exit nodes to enter their networks. The Tor Project maintains a list of Tor exit nodes that changes frequently, which makes the task of blocking changes relatively easy.Note: Some security products (e.g., Cisco Next Generation Firepower software) have the ability to dynamically learn about Tor egress nodes and automatically 'block traffic from these nodes.12.7 Security Monitoring and Peering to Peer-to-Peer Communications..... Peer-to-peer (P2P) communication involves a distributed method of "dividing up any (11) service" between peers involved in a computation.(11 service") distributed architecture among participating peers. Within a P2P network, each peer has the same privileges, which is why the network is called a "peer-to-peer" node network.This is why the network is called a "peer-to-peer" network of nodes. A computer or node participating in P2P reserves a large amount of its resources (e.g., CPU, memory, disk storage, and network bandwidth resources) so that other "peers" or participants can access them. All of this can be done without the intervention of a centralized server. Within a P2P network, each peer can be both a provider and a consumer of resources or data. The 1990s music sharing application N stei. is a standard P2P application.464 Chapter 12 Operational Challenges Facing Security MonitoringP2P networks have long been used to share music, video, pirated books, and other data, and even legitimate multimedia applications such as Spotify rely on P2P networks plus streaming servers to deliver audio and video to clients. There is even a P2P cryptocurrency application called Peercoin (also known as PPCoin), which operates using both Proof ofStake and Proof ofWork mechanisms.Many universities (e.g., MIT and Penn State) have set up a project called LionShare, which serves to share files between educational institutions around the world.P2P systems pose a peculiar problem for security monitoring. Malware can use P2P networks to communicate and spread to victims. Many "free" or pirated music and video files are often "accompanied" by malware. In addition, like any other type of software, P2P software is not immune to security vulnerabilities. This naturally poses a risk to P2P software. In addition, P2P software is more vulnerable to remote attacks, thanks to the nature of the P2P network architecture.