Which three protocols can be encapsulated within a GRE tunnel on a Junos device? (Choose three.)
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A. B. C. D. E.ACD
GRE (Generic Routing Encapsulation) is a tunneling protocol that allows the encapsulation of one protocol over another protocol. In the case of a Junos device, GRE tunneling can encapsulate the following protocols:
A. AppleTalk: AppleTalk is a legacy protocol developed by Apple Computer Inc. that allows the communication of Apple devices over a network. While it is possible to encapsulate AppleTalk traffic within a GRE tunnel on a Junos device, it is not commonly used in modern networks as AppleTalk has been largely replaced by newer protocols.
C. IPv6: IPv6 is the latest version of the Internet Protocol (IP) and is designed to replace IPv4, the current version of IP. IPv6 provides many enhancements over IPv4, including larger address space, better security, and improved QoS. GRE tunneling can encapsulate IPv6 traffic, allowing it to be transmitted over an IPv4 network.
D. MPLS: MPLS (Multiprotocol Label Switching) is a protocol used to route traffic between different networks or domains. MPLS allows for the creation of virtual private networks ( VPNs) and can be used to provide Quality of Service (QoS) guarantees. GRE tunneling can encapsulate MPLS traffic, allowing it to be transmitted over an IP network.
E. Ethernet: Ethernet is a local area networking (LAN) technology that is commonly used to connect devices within a network. While Ethernet is typically used at the access layer of a network, it is possible to encapsulate Ethernet traffic within a GRE tunnel on a Junos device. This allows Ethernet traffic to be transmitted over an IP network.
In summary, the three protocols that can be encapsulated within a GRE tunnel on a Junos device are IPv6, MPLS, and Ethernet. While it is possible to encapsulate other protocols, such as AppleTalk, it is not commonly used in modern networks.