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Telnet and FTP connections may be prohibited from being established to a mail or database server, but they may be allowed for the respective service servers. This is a fairly simple method of filtering based on information in each packet header, such as IP addresses and TCP/UDP ports. Packet filtering will not detect and catch all undesired packets, but it is fast and efficient. To look at all packets and determine the need for each and its data requires stateful packet filtering. Stateful means that the firewall maintains, or knows, the context of a conversation.
One serious operational security issue with routers concerns the access to a router and control of its internal functions. Routers can be accessed using the Simple Network Management Protocol (SNMP) and Telnet and can be programmed remotely. Because of the geographic separation of routers, this can become a necessity, for many routers in the world of the Internet can be hundreds of miles apart in separate locked structures. Physical control over a router is absolutely necessary, for if any device, be it server, switch, or router, is physically accessed by a hacker, it should be considered compromised; thus, such access must be prevented.
Jobs for security administrators are expected to increase by 18%—the skill set required for these types of jobs maps to the CompTIA Security+ certification. • Network Security Administrators can earn as much as $106,000 per year. • CompTIA Security+ is the first step in starting your career as a Network Security Administrator or Systems Security Administrator. • More than 250,000 individuals worldwide are CompTIA Security+ certified. S. government contractors. S. 01-M directive, for Information Assurance Technical Level II and Management Level I job roles.