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The serial interfaces on R1 and R2 has been configured as shown in the exhibit. However, pings on each side are failing.
What is the most likely cause of this connectivity problem?
the configured layer 2 encapsulation on both routers does not match
The Maximum Transmission Unit exceeds the maximum size on both routers
The bandwidth does not match
The IP addresses must reside on the 10.1.1.0/30 subnet
The serial interfaces on R1 and R2 are administratively down
R1 needs to have clockrate set to 768
In order for the routers (in the scenario) to communicate with each other, they must have the same encapsulation method (in this case R2 uses PPP while R1 uses default HDLC). They must also reside on the same subnet (which is already configured correctly). The MTU or Maximum Transmission Unit is 1500 (configured correctly). The bandwidth does not need to match for this scenario and the interfaces up/down status means layer 2 problem is causing the lack of connectivity. - - - - - - -/ While not having a clock rate set on the DCE side "would" give the exact same conditions, it isn't clear from the exhibit which side would be the DCE, and or even if the clock rate has been set or not, but in any event, L2 encapsulation mismatch is a guaranteed way to get this status, BTW the lowest allowable clockrate is 1200 (bits-perSec)
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