Certified Information Systems Security Professional (CISSP) Practice Exam

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Which protocol is used in Layer 2 tunneling?

PPTP
LEAP
L2TP
ISDN

The correct answer is: L2TP

Layer 2 Tunneling Protocol (L2TP) is specifically designed for tunneling various network protocols at Layer 2 of the OSI model. This protocol enables the encapsulation of data packets from one network to another over a shared network, effectively allowing for the creation of Virtual Private Networks (VPNs). By functioning at the data link layer, L2TP supports the transfer of multiple types of network protocols and facilitates secure connections between remote users and corporate networks. L2TP combines elements of both PPTP and L2F (Layer 2 Forwarding Protocol). While PPTP is a more common tunneling protocol, it operates primarily at Layer 3 and for certain features may not be as secure as L2TP. L2TP is often paired with IPsec to enhance security, providing encryption and ensuring data confidentiality while in transit. Understanding tunneling protocols like L2TP is essential for network security professionals because they allow for safe transmission of data over potentially insecure networks. In contrast, the other choices represent protocols or technologies that don't serve the same tunneling function at Layer 2.