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ARP spoofing is a local network attack where an attacker links their MAC address with the IP address of a legitimate computer or router, typically affecting devices on the same subnet, not external internet users.

SQL injection targets databases through vulnerabilities in web application input fields, leading to data manipulation or extraction, but it wouldn't cause different content to be displayed based on whether the user is internal or external without the underlying web server being compromised.

DNS poisoning occurs when an attacker redirects legitimate traffic to a malicious server by corrupting DNS resolver caches or authoritative DNS servers. In this scenario, external users see the defaced site because their DNS queries resolve to the attacker's server, while internal users, likely using internal DNS that remains uncompromised, see the correct website.

Routing table injection involves manipulating routing protocols to redirect network traffic, which would affect all users reaching the server via the compromised route, not selectively external users while internal users remain unaffected.