In 2021, a misconfiguration in this protocol not only caused Facebook’s DNS servers to be unreachable, but also locked out employees from physically accessing machines to fix the mistake. For 10 points each:
[10h] Name this protocol that uses TCP port 179 by default. This protocol is used to find optimal routes between autonomous systems on a network.
ANSWER: Border Gateway Protocol [or BGP]
[10m] Because Facebook’s domain name system was a single point of failure, it lacked this property. This property, which refers to duplicating hardware and software components to reduce the consequences of failures, improves fault tolerance.
ANSWER: redundancy
[10e] The Facebook outage caused a loss of routes using this protocol, often paired with TCP. This protocol’s namesake addresses, such as 127.0.0.1 for localhost, uniquely identify devices on a network.
ANSWER: IP [or Internet Protocol; accept TCP/IP; accept IPv4 or IPv6]
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