The Versa Operating System (VOS™), also known as FlexVNF, is a comprehensive software platform that integrates a wide range of networking and security functions. Among its extensive feature set, VOS explicitly includes Carrier-Grade NAT (CGNAT) for large-scale address translation, full support for IP Multicast routing protocols (such as PIM-SM, PIM-SSM, and IGMP), and the ability to function as a Network Time Protocol (NTP) server to provide time synchronization for other devices within the network. These features are integral to its routing, security, and network services capabilities.

A. HTTP Proxy: VOS provides Secure Web Gateway (SWG) functionality which transparently proxies web traffic for security inspection, but it is not offered as a traditional, standalone HTTP Proxy service.

B. CDN: A Content Delivery Network (CDN) is a geographically distributed network of servers. This is a type of service, not an integrated feature of a single network operating system like VOS.

1. Versa Networks

"Versa VOS™ (FlexVNF) Software Datasheet":

Page 2

"Network Services" section: Lists "NAT (NAT44

NAT64

NPTv6

CGNAT)" as a supported feature. This validates option C.

Page 2

"Advanced Routing" section: Lists "Multicast (PIM-SM

PIM-SSM

IGMP v1/v2/v3)" as a supported feature. This validates option D.

2. Versa Networks

"VOS 21.2.2 Configuration and Administration Guide":

Section: "Configuring NTP": Details the command hierarchy set system services ntp server