Ccna routing and Switching Complete Study Guide

20.  B.  Generic Routing Encapsulation (GRE) has no built-in security mechanisms. See  

Chapter 21 for more information.

21.  C.  When traffic exceeds the allocated rate, the policer can take one of two actions. It can 

either drop traffic or re-mark it to another class of service. The new class usually has a 

higher drop probability. See Chapter 21 for more information.

22.  B.  This can be a hard question if you don’t remember to invert the 7th bit of the first octet 

in the MAC address! Always look for the 7th bit when studying for the Cisco R/S, and 

when using eui-64, invert it. The eui-64 autoconfiguration then inserts an FF:FE in the 

middle of the 48-bit MAC address to create a unique IPv6 address. See Chapter 14 for more 

information.

23.  A.  The NDP neighbor advertisement (NA) contains the MAC address. A neighbor 

solicitation (NS) was initially sent asking for the MAC address. See Chapter 14 for 

more information.

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Answers to Assessment Test