CCNA Discovery 1 - Module 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
• encapsulation
• encoding
• multicasting
• 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?
• modem
• switch
• router
• hub

10. Which two networking devices are used to connect hosts to the access layer? (Choose two.)
• router
• hub
• switch
• server
• computer

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?
• ARP
• DHCP
• DNS
• WINS

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.)
• NIC
• switch
• 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.