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 

1. Which ISDN specification deals with call Setup and Teardown? A.) J-Series B.) F-Series C.) Q-Series D.) I- Series E.) World Series 

C The 2 most important ISDN specifications are Q & I: Q = Call setup and teardown. I = Concepts and terminology. 

2. Which command will set a routers network name to ’myrouter’? A.) network name myrouter B.) display myrouter C.) hostname myrouter D.) name myrouter E.) network myrouter 

C 

3. When a Distance Vector routing protocol detects that a connected network has gone down, it sends out a special routing update packet, telling all directly connected routers that the distance to the dead network is infinity. This is an example of which routing technology? A.) Only Link State routing protocols have this intelligence. B.) Poison Reverse. C.) Triggered updates. D.) Garrison-4. E.) ICMP. F.) Split Horizon. 

B Instead of just removing the route from the routing update, Poison Reverse sets the distance to ’infinity’ (for IP RIP this is a hop count of 16). This immediately makes the route invalid for all neighboring routers. 

4 What is the standard ISDN term for a native ISDN modem? A.) TE3 B.) ET C.) LE D.) TE2 E.) TA 

E The marketing term ’ISDN modem’ was created to help sell the ISDN idea to America. There is no such thing as an analog modulator demodulator for digital ISDN. The Terminal Adapter (TA) allows you to connect a PC to a digital ISDN line directly. In the real world, ISDN is digital, modems are analog. 

5 Which of the following are Transport layer protocols? (3 answers) A.) NFS B.) SPX C.) UDP D.) TCP E.) IP 

B C D 

6. Which command would configure Interface E0 with an IP address of 12.23.4.5 using a Subnet mask of 255.255.255.0 ? A.) that is an invalid mask for a class ’A’ address B.) ip address 12.23.4.5 /24 C.) ip address 12.23.4.5 255.255.255.0 D.) ip address 12.23.4.5 mask 255.255.255.0 E.) ip address 12.23.4.5 mask ff:ff:ff:0 

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