Summary

In this chapter, we learned about the evolution of networking and how the internet came into existence. Then, we learned about two important protocol models: the OSI reference model and the TCP/IP protocol suite. However, only TCP/IP is implemented on devices, which allows messages to be exchanged across a network. Furthermore, we looked at the roles and functions of various networking components and how they forward messages between devices. Lastly, we covered the essentials of the Cisco 2 Tier and 3 Tier architectures in detail to help you understand how to design a campus LAN for an organization.

I hope this chapter has been informative for you and that it will be helpful in your journey toward learning how to implement and administrate Cisco solutions and preparing for the CCNA 200-301 certification. In the next chapter, Getting Started with Cisco IOS Devices, we will learn how to access and configure Cisco IOS devices while building a small network.

Questions

Here's a short list of review questions to help reinforce your learning and help you identify gaps in your knowledge:

1. Which layer of the OSI reference model is responsible for encapsulating the physical address of a device?

   A. Internet

   B. Data link

   C. Network

   D. Link

2. An employee uses Microsoft Outlook on their client PC to send and receive emails to/from others. Which is the highest layer of the OSI model?

   A. Presentation

   B. Internet

   C. Session

   D. Application

3. The physical address of a device is made up of how many bits?

   A. 32

   B. 42

   C. 48

   D. 52

4. Which layer of the TCP/IP protocol suite is responsible for computing the checksum (hash) and determining whether a frame is damaged?

   A. Network access

   B. Data link

   C. Physical

   D. LLC

5. In which layer of the TCP/IP protocol suite does routing occur?

   A. Network

   B. Internet

   C. Router

   D. Data link

6. What does a Cisco switch use to make the decision to forward a message across a network?

   A. Destination IP address

   B. Destination MAC address

   C. Source MAC address

   D. Source IP address

7. Which network protocol is used to resolve the MAC address to the IP address of a host on the same local area network?

   A. ARP

   B. HTTP

   C. TCP

   D. UDP

8. Which device is used to extend a network to another room or floor of a building?

   A. Router

   B. Firewall

   C. Switch

   D. Hub

9. Where does a Cisco switch store MAC addresses?

   A. RAM

   B. HDD

   C. ROM

   D. CAM

10. Which layer of the Cisco Campus LAN architecture is responsible for interconnecting different branch offices?

    A. Router

    B. Core

    C. Distribution

    D. Access

    E. All of the above