Cisco: Benefits of Layered Network Models

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What are the two layered models that describe network operations?

Open System Interconnection (OSI) Reference Model and TCP/IP Reference Model

What is one benefit of using a layered model in protocol design?

Protocols that operate at a specific layer have defined information that they act upon and a defined interface to the layers above and below

How does a layered model promote competition among vendors?

Products from different vendors can work together

What is one advantage of using a layered model in mitigating the impact of technology changes?

Changes in one layer do not affect other layers above and below Signup and view all the answers

What is one benefit of using a layered model in describing networking functions and capabilities?

Provides a common language to describe networking functions and capabilities Signup and view all the answers

What addresses are needed to move a packet from the source to the destination?

MAC Address (Source and destination) and IP Address (Source and destination). Signup and view all the answers

How are hostnames or URLs translated to IP addresses?

They are translated to IP addresses. Signup and view all the answers

Why is a gateway IP address necessary for every host?

To communicate with remote devices in other networks. Signup and view all the answers

What protocol can be used to obtain a physical address (MAC address)?

Address Resolution Protocol (ARP). Signup and view all the answers

What happens to the data in a packet as it travels from network to network?

The data itself is never modified, but some addresses may change. Signup and view all the answers

What is the exception to the rule that Layer 3 addresses (IP addresses) do not change?

Network Address Translation (NAT). Signup and view all the answers

What is the primary function of the Network Layer (Layer 3) in the OSI model?

To provide services to exchange the individual pieces of data over the network. Signup and view all the answers

How does the TCP/IP model differ from the OSI model in terms of layer division?

The OSI model divides the network access layer and the application layer of the TCP/IP model into multiple layers. Signup and view all the answers

What is the role of the Data Link Layer (Layer 2) in the OSI model?

To describe methods for exchanging data frames over a common media. Signup and view all the answers

In the TCP/IP model, what is the primary function of the Internet Layer?

To determine the best path through the network (Routing). Signup and view all the answers

What is the primary function of the Transport Layer (Layer 4) in the OSI model?

To define services to segment, transfer, and reassemble the data for individual communications. Signup and view all the answers

What is the primary function of the Physical Layer (Layer 1) in the OSI model?

To describe the means to activate, maintain, and de-activate physical connections. Signup and view all the answers

Cisco: Benefits of Layered Network Models

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