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ccna best dumps.7.4.5.4 Simple Certificate Registration ProtocolThe deployment of public key technologies is growing and is becoming the foundation for standards-based security such as IPSec and IKE protocols. As public key certificates are used in network security protocols, the need for certificate management protocols for PKI clients and CA servers has arisen. These clients and servers support certificate lifecycle operations, such as certificate registration and revocation and certificate and CRL access.For example, an end entity starts an enrollment transaction by creating a certificate request using PKCS#10 (Certificate Request Syntax Standard) and sends this request to a CA developed using PKCS#7 (Cryptographic Message Syntax Standard) o The CA receives the request and can perform one of the following three functions.Automatically approve the request. Send the certificate back. Force the end entity to wait until the operator is able to manually authenticate the identity of the requesting end entity. Note: PKCS #7 andPKCS #10 standards are commonly used in PKI communication protocols that are used in VPNPKI registration.The ultimate goal is for any network user to be able to easily request a digital certificate electronically. Previously, these processes required significant input from network administrators and were therefore not suitable for large-scale deployment. The IETF has designed the SimpleCertificateEnrollmentProtocol (SCEP) to make the issuance and revocation of digital certificates as scalable as possible. The goal of SCEP is to support the secure issuance of certificates to network devices in a scalable manner, using existing technologies as much as possible.SCEP is currently provided as a reference for network device manufacturers and software companies that are developing simplified ways to handle day-to-day user certificate operations for large-scale implementations. Currently, network device manufacturers and software companies use SCEP as a reference when developing simplified ways to handle large-scale certificate implementations for everyday users.7.4.6 Certification Authority7.4.6.1 Single Root PKI TopologyPKI is capable of forming different trust topologies, including the single-root PKI topology, the hierarchical CA topology, and the cross-certified CA topology. In the single-root PK1 model, a single CA (also known as the root CA) issues all certificates to end users. The advantages of this approach are simplicity and the disadvantages are the following child items.