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Ethernet Switching

Contents

  1. Objectives
  2. Key Terms
  3. Introduction (7.0)
  4. Ethernet Frames (7.1)
  5. Ethernet MAC Address (7.2)
  6. The MAC Address Table (7.3)
  7. Switch Speeds and Forwarding Methods (7.4)
  8. Summary (7.5)
  9. Practice
  10. Check Your Understanding Questions

Chapter Description

In this sample chapter from Introduction to Networks Companion Guide (CCNAv7) for Cisco Networking Academy students, you will review available switching forwarding methods and port settings on Layer 2 switch ports.

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Check Your Understanding Questions

Complete all the review questions listed here to test your understanding of the topics and concepts in this chapter. The appendix “Answers to ‘Check Your Understanding’ Questions” lists the answers.

1. Which network device makes forwarding decisions based only on the destination MAC address that is contained in a frame?

  1. repeater

  2. hub

  3. Layer 2 switch

  4. router

2. For which network device is the primary function to send data to a specific destination based on the information found in the MAC address table?

  1. hub

  2. router

  3. Layer 2 switch

  4. modem

3. What does the LLC sublayer do?

  1. It performs data encapsulation.

  2. It communicates with upper protocol layers.

  3. It is responsible for media access control.

  4. It adds a header and trailer to a packet to form an OSI Layer 2 PDU.

4. Which statement is true about MAC addresses?

  1. MAC addresses are implemented by software.

  2. A NIC needs a MAC address only if it is connected to a WAN.

  3. The first 3 bytes are used by the vendor-assigned OUI.

  4. The ISO is responsible for MAC address regulations.

5. What happens to a runt frame received by a Cisco Ethernet switch?

  1. The frame is dropped.

  2. The frame is returned to the originating network device.

  3. The frame is broadcast to all other devices on the same network.

  4. The frame is sent to the default gateway.

6. What are the minimum and maximum sizes of an Ethernet frame? (Choose two.)

  1. 56 bytes

  2. 64 bytes

  3. 128 bytes

  4. 1024 bytes

  5. 1518 bytes

7. What addressing information does a switch record in order to build its MAC address table?

  1. the destination Layer 3 addresses of incoming packets

  2. the destination Layer 2 addresses of outgoing frames

  3. the source Layer 3 addresses of outgoing frames

  4. the source Layer 2 addresses of incoming frames

8. Which two characteristics describe Ethernet technology? (Choose two.)

  1. It is supported by IEEE 802.3 standards.

  2. It is supported by IEEE 802.5 standards.

  3. It typically uses an average of 16 Mbps for data transfer.

  4. It uses unique MAC addresses to ensure that data is sent to and processed by the appropriate destination.

  5. It uses a ring topology.

9. What statement describes MAC addresses?

  1. They are globally unique.

  2. They are routable only within the private network.

  3. They are added as part of a Layer 3 PDU.

  4. They have 32-bit binary values.

10. What is the special value assigned to the first 24 bits of a multicast MAC address?

  1. 01-5E-00

  2. FF-00-5E

  3. FF-FF-FF

  4. 01-00-5E

11. What will a host on an Ethernet network do if it receives a frame with a destination MAC address that does not match its own MAC address?

  1. It will discard the frame.

  2. It will forward the frame to the next host.

  3. It will remove the frame from the media.

  4. It will strip off the data link frame to check the destination IP address.

12. What is auto-MDIX?

  1. a type of Cisco switch

  2. an Ethernet connector type

  3. a feature that automatically determines speed and duplex

  4. a feature that detects Ethernet cable type

13. Which two functions or operations are performed by the MAC sublayer? (Choose two.)

  1. It is responsible for media access control.

  2. It performs the function for NIC driver software.

  3. It adds a header and trailer to form an OSI Layer 2 PDU.

  4. It handles communication between upper and lower layers.

  5. It adds control information to the network protocol header.

14. What type of address is 01-00-5E-0A-00-02?

  1. an address that reaches every host inside a local subnet

  2. an address that reaches one specific host

  3. an address that reaches every host in the network

  4. an address that reaches a specific group of hosts

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