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Which one of the following tunneling protocols works only at the Session layer?
Ipx
L2TP
None of the Above
PPTP
SSH
HF: CBK reference that PPTP is on layer 5 is on page 466 in CBK. Also https://en.wikipedia.org/wiki/Listofnetworkprotocols(OSI_model) ***UMM ... PPTP works at Layer 2 (Data-link)..........Source is everything that shows up on google when you type in "OSI Layer for PPTP". Added a new answer "None of the Above" .. Correct answer is PPTP. L2TP works at layer 2. CISSP Official Study Guide - Seventh edition P. 431 Data Link Layer The Data Link layer (layer 2) is responsible for formatting the packet from the Network layer into the proper format for transmission. The proper format is determined by the hardware and the technology of the network. There are numerous possibilities, such as Ethernet (IEEE 802.3), Token Ring (IEEE 802.5), asynchronous transfer mode (ATM), Fiber Distributed Data Interface (FDDI), and Copper DDI (CDDI). However, only Ethernet remains a common Data Link layer technology in use in modern networks. Within the Data Link layer resides the technology-specifi c protocols that convert the packet into a properly formatted frame. Once the frame is formatted, it is sent to the Physical layer for transmission. The following list includes some of the protocols found within the Data Link layer: ■ Serial Line Internet Protocol (SLIP) ■ Point-to-Point Protocol (PPP) ■ Address Resolution Protocol (ARP) ■ Reverse Address Resolution Protocol (RARP) ■ Layer 2 Forwarding (L2F) ■ Layer 2 Tunneling Protocol (L2TP) ■ Point-to-Point Tunneling Protocol (PPTP) ■ Integrated Services Digital Network (ISDN)
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