Which statement regarding the benefits of using GRE instead of IP-IP tunneling is true?
A.
GRE supports both IP traffic and non-IP traffic.
B.
GRE supports encryption.
C.
GRE supports private IP addresses over the Internet.
D.
GRE supports authentication.
Explanation:
Configuring CoS for TunnelsCoS queuing, scheduling, and shaping allow you to control and improve the flow of traffic through tunnel interfaces like GRE and IP-IP interfaces. The GRE and IP-IP interfaces on a J Series device are internal, configurable interfaces named gr-0/0/0 and ip-0/0/0.
To configure CoS for a GRE or IP-IP tunnel, you must first enable tunnel queuing on the router. If tunnel queuing is not enabled, the router continues to send traffic through the tunnel but ignores any configured CoS schedulers and shapers.
Note: You cannot enable tunnel queuing on J Series interfaces other than tunnel interfaces, although the router allows you to commit such a configuration.
Limitations on CoS Shapers for Tunnel Interfaces
On a J Series device, when defining a CoS shaping rate on a tunnel interface, be aware of the following restrictions:
* The shaping rate on the tunnel interface must be less than that of the physical egress interface.
* The shaping rate only measures the packet size that includes the Layer 3 packet with GRE or IP-IP encapsulation. The Layer 2 encapsulation added by the physical interface is not factored into the shaping rate measurement.
* The CoS behavior works as expected only when the physical interface carries the shaped GRE or IP-IP tunnel traffic alone. If physical interface carries other traffic, thereby lowering the available bandwidth for tunnel interface traffic, the CoS features do not work as expected.
* You cannot configure a logical interface shaper and a virtual circuit shaper simultaneously on the router. If virtual circuit shaping is desired, do not define a logical interface shaper. Instead, define a shaping rate for all the virtual circuits.