What type of interface is a tunnel interface?

What type of interface is a tunnel interface?

A.
sub-interface

B.
virtual interface

C.
physical interface

D.
redundant interface

Explanation:

Physical Interface -EveryNetScreenfirewall has some sort of physicalinterface.Theseinterfaces are
usedto connect the firewall to the network.
Sub Interface -Subinterfacesare used primarily with VLANs. All of thesubinterfacesthat are bound to a physical interface can only use the bandwidth that is provided by that interface. Aggregate Interface -When you create an aggregate interface you are binding multiple physical interfaces
togetherto create one superinterface.Thisinterface acts as if it was a single physical interface. It provides cumulative bandwidth.
Redundant Interface- The redundant interface is much like the aggregate interface, but only has one of
thetwo benefits of the aggregate interface. Redundant interfaces are unable to combine their bandwidth, and only provide redundancy in case of afailure.Thisis still a great option to use when redundancy is a requirement.
VLAN 1 Interface -The redundant interface is much like the aggregate interface, but only has one of the two benefits of the aggregate interface. Redundant interfaces are unable to combine their bandwidth, and only provide redundancy in case of afailure.Thisis still a great option to use when redundancy is a requirement.
Virtual Security Interface-This type of interface is used when twoNetScreendevices are used in a high availabilityconfiguration.Thetwo firewalls are combined to create a single entity called a virtual security device (VSD). Each device in the cluster defines a physical interface to create a VSI.ThisVSI has its own MAC address and IP address and operates just like a physical interface. Management Interface- SomeNetScreenfirewalls contain an interface dedicated for management of the
device.Thisinterface is called the MGT interface. It allows you to separate the management of the device from rest of the network by using this special interface. HA Interface-OnNetScreensystems (NetScreen-500 and later), each device contains two HA interfaces, HA1, and HA2.These interfaces are used exclusively for high availability. One interface passes control messages to eachdevice.Thesecond HA interface is used for traffic synchronization. If one of the interfaces fails, the remaining HA interface would provide both services.
Tunnel Interface-A tunnel interface is used as a gateway to aVPN.Thisallows you to create a VPN configuration and then bind that VPN to the tunnel interface.If you wanted to pass traffic to the VPN, you would simply create a route on your firewall to point to the tunnel interface for the remotenetwork.TheVPN will be automatically established and traffic will be encrypted and sent to the remotegateway.Tunnelinterfaces are virtual and are only used forVPNs. Loopback Interface-The loopback interface is a special interface. It is a virtual interface that does not exist
exceptlogically inside of the firewall. A loopback interface is assigned to a zone and it is not accessible from other zones unless you specify a policy to permit the traffic. A loopback interface can be used to manage your firewall as well as to manage it.