52 Which of the following describe SMTP? (2 Answers) A.) Used for managing IP devices. B.) Uses ICMP C.) Uses TCP. D.) Used for downloading files to the router. E.) Uses UDP. F.) Used for sending e-mail. 
C F Send / Simple (depending on literature) Mail Transport Protocol (SMTP) is used for delivering mail to other mail servers. It uses port 25, and relies on TCP. 
53 What are the valid Host ID’s for 161.37.2.50 /28 (12 bits of subnetting)? A.) 161.37.2.49 - 161.37.2.63 B.) 161.37.0.0 - 161.37.255.254 C.) 161.37.2.48 - 161.37.2.63 D.) 161.37.2.0 - 161.37.2.254 E.) 161.37.2.49 - 161.37.2.62 

E Below is a very easy to use shortcut that requires no binary math: Figure out the mask: /28 = 255.255.255.240 Figure out the subnet multiple: 256-240=16 Subnets are: 16,32,48,64,80, etc This is subnet 48, the next subnet is 64, so the broadcast address is 63. Everything between the subnet (48) and broadcast (63) are the valid hosts. In this example, based on the given mask, the valid host ranges are 49-62. 

54 Which layer of the 7 layer model provides services to the Application layer over the Session layer connection? A.) Transport B.) Presentation C.) Session D.) Network E.) Application F.) Datalink 
B 
55 Which OSI Reference Layer controls application to application communication? A.) Transport B.) Session C.) Physical D.) Network E.) Datalink 
B The Session layer controls a conversation between applications. The Transport layer controls communications between hosts. 
56 There is an emergency fall-back ’skeleton’ IOS stored in read only memory on all Cisco routers. What command would make the router load the IOS from Read Only Memory? A.) load ios rom B.) bootsystem skeleton C.) boot system rom D.) load ios bootflash E.) reload rom 
C

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