CCNA Discovery 1 Chapter 3

1. Which term is used to describe the process of placing one message format into another format so that the message can be delivered across the appropriate medium?
 flow control 

 access method

2. Refer to the graphic. Five PCs are connected through a hub. If host H1 wants to reply to a message from host H2, which statement is true?
H1 sends a unicast message to H2, but the hub forwards it to all devices. 

 H1 sends a unicast message to H2, and the hub forwards it directly to H2. 
 H1 sends a broadcast message to H2, and the hub forwards it to all devices. 
 H1 sends a multicast message to H2, and the hub forwards it directly to H2.

3. Which two statements concerning networking standards are true? (Choose two.)
 adds complexity to networks 

 encourages vendors to create proprietary protocols 
 provides consistent interconnections across networks 
 ensures that communications work best in a single-vendor environment 
 simplifies new product development

4. What does the 100 mean when referencing the 100BASE-T Ethernet standard?
 type of cable used 

 type of data transmission 
 speed of transmission 
 type of connector required 
 maximum length of cable allowed

5. Which address does an NIC use when deciding whether to accept a frame?
 source IP address 

 source MAC address 
 destination IP address 
 destination MAC address
 source Ethernet address

6. Which type of address is used in an Ethernet frame header?
 logical addresses only 

 IP addresses only 
 MAC addresses only 
 broadcast addresses only

7. What is the function of the FCS field in an Ethernet frame?
 detects transmission errors 

 provides timing for transmission 
 contains the start of frame delimiter 
 indicates which protocol will receive the frame

8. What is the purpose of logical addresses in an IP network?
 They identify a specific NIC on a host device. 

 They are used to determine which host device accepts the frame. 
 They provide vendor-specific information about the host. 
 They are used to determine the network that the host is located on. 
 They are used by switches to make forwarding decisions.

9. Which device accepts a message on one port and always forwards the message to all other ports?


10. Which two networking devices are used to connect hosts to the access layer? (Choose two.)


11. Host A needs to learn the MAC address of Host B, which is on the same LAN segment. A message has been sent to all the hosts on the segment asking for the MAC address of Host B. Host B responds with its MAC address and all other hosts disregard the request. What protocol was used in this scenario?


12. A switch receives a frame with a destination MAC address that is currently not in the MAC table. What action does the switch perform?
 It drops the frame. 

 It sends out an ARP request looking for the MAC address. 
 It floods the frame out of all active ports, except the origination port. 
 It returns the frame to the sender.

13. What is a benefit of having a router within the distribution layer?
 prevents collisions on a local network 

 keeps broadcasts contained within a local network 
 controls which hosts have access to the network 
 controls host-to-host traffic within a single local network

14. Refer to the graphic. What does the router do after it determines that a data packet from Network 1 should be forwarded to Network 2?
 It sends the data packet as it was received. 

 It reassembles the frame with different MAC addresses than the original frame. 
 It reassembles the data packet with different IP addresses than the original data packet. 
 It reassembles both the packet and the frame with different destination IP and MAC addresses.

15. Which table does a router use to make decisions on where a data packet is to be sent?
 ARP table 

 routing table 
 network table 
 forwarding table

16. If the default gateway is configured incorrectly on the host, what is the impact on communications?
 The host is unable to communicate on the local network. 

 The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks. 
 The host can communicate with other hosts on remote networks, but is unable to communicate with hosts on the local network. 
 There is no impact on communications.

17. What device is typically used as the default gateway for a computer?
 a server hosted by the ISP 

 the router interface closest to the computer 
 a server managed by a central IT department 
 the switch interface that connects to the computer

18. If a router receives a packet that it does not know how to forward, what type of route must be configured on the router to prevent the router from dropping it?
 dynamic route 

 default route 
 destination route 
 default destination

19. Which two items are included in a network logical map? (Choose two.)
 naming scheme

 IP addressing scheme 
 length of cable runs 
 physical location of networking devices 
 specific layout of interconnections between networking devices and hosts

20. An integrated router can normally perform the functions of which two other network devices? (Choose two.)

 e-mail server 
 application server 
 wireless access point

21. What is a reason for disabling simple file sharing?
 It enables the user to map a remote resource with a local drive. 

 It enables the user to share all files with all users and groups. 
 It enables the user to share printers. 
 It enables the user to set more specific security access levels.

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