Ccna routing and Switching Complete Study Guide

46.  B.  Hubs regenerate electrical signals, which are specified at the Physical layer. See  

Chapter 1 for more information.

47.  A, C.  Standard and extended access control lists (ACLs) are used to configure security on a 

router. See Chapter 12 for more information.

48.  C.  If you start at 192.168.128.0 and go through 192.168.159.0, you can see that this is a 

block of 32 in the third octet. Since the network address is always the first one in the range, 

the summary address is 192.168.128.0. What mask provides a block of 32 in the third 

octet? The answer is 255.255.224.0, or /19. See Chapter 5 for more information.

49.  B.  The command to back up the configuration on a router is 

copy running-config 

startup-config. See Chapter 7 for more information.

50.  C.  IEEE 802.3ab is the standard for 1 Gbps on twisted-pair. See Chapter 2 for more 

 information.

51.  C.  User Datagram Protocol is a connection network service at the Transport layer, and 

DHCP uses this connectionless service. See Chapter 3 for more information.

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Answers to Assessment Test