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2. IPv4 address exhaustion - Wikipedia

   en.wikipedia.org/wiki/IPv4_address_exhaustion

   The Internet Engineering Task Force (IETF) created the Routing and Addressing Group (ROAD) in November 1991 to respond to the scalability problem caused by the classful network allocation system in place at the time. [20] [2] IPv6, the successor technology to IPv4, was designed to address this problem.

3. Troubleshoot a broadband internet connection - AOL Help

   help.aol.com/articles/troubleshooting-a...

   Check if you can visit other sites with a different browser - If you can go to another site, the problem may be associated the browser you're using. If you don't have another browser, download a supported one for free. 2. Check the physical connection - A loose cable or cord can often be the cause of a connection problem. Make sure everything ...

4. Address Resolution Protocol - Wikipedia

   en.wikipedia.org/wiki/Address_Resolution_Protocol

   This helps to resolve problems that would otherwise occur if, for example, a network card was recently changed (changing the IP-address-to-MAC-address mapping) and other hosts still have the old mapping in their ARP caches. ARP announcements are also used by some network interfaces to provide load balancing for incoming traffic.

5. Zero-configuration networking - Wikipedia

   en.wikipedia.org/wiki/Zero-configuration_networking

   Apple Mac OS and MS Windows have supported link-local addresses since Windows 98 and Mac OS 8.5 (both released in 1998). [1] Apple released its open-source implementation in the Darwin bootp package. Avahi contains an implementation of IPv4LL in the avahi-autoipd tool. Zero-Conf IP (zcip) [36] BusyBox can embed a simple IPv4LL implementation.

6. ping (networking utility) - Wikipedia

   en.wikipedia.org/wiki/Ping_(networking_utility)

   Possible ping results indicating a problem include the following: H,!N or !P – host, network or protocol unreachable; S – source route failed; F – fragmentation needed; U or !W – destination network/host unknown; I – source host is isolated; A – communication with destination network administratively prohibited

7. Explicit Congestion Notification - Wikipedia

   en.wikipedia.org/wiki/Explicit_Congestion...

   ECN allows end-to-end notification of network congestion without dropping packets. ECN is an optional feature that may be used between two ECN-enabled endpoints when the underlying network infrastructure also supports it. Conventionally, TCP/IP networks signal congestion by dropping packets.

8. Network address translation - Wikipedia

   en.wikipedia.org/wiki/Network_address_translation

   Mapping of Address and Port is a Cisco proposal that combines Address plus Port translation with tunneling of the IPv4 packets over an ISP provider's internal IPv6 network. In effect, it is an (almost) stateless alternative to carrier-grade NAT and DS-Lite that pushes the IPv4 address /port translation function (and the maintenance of NAT state ...

9. Fix problems signing in to AOL Mail

   help.aol.com/articles/fix-problems-signing-in-to...

   While most sign in problems can stem from password issues, you might also get blank or missing screens, or various errors when trying to sign in. No matter the problem you're experiencing, the following troubleshooting steps should help you get back in your AOL Mail quickly. Sign in again