As a network administrator, the Internet is your best friend for networking resources, solutions, news, and guidance. Here are some websites for you to visit often.
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To register domains:
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To check your TCP/IP configuration: DNSstuff
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To see if your email server has been blocklisted: DNSBL.info
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To stay current in the industry, try these standards organizations:
Institute of Electrical and Electronics Engineers
International Organization for Standardization