Slide kiểm thử xâm nhập chương 4 undersatnding host to host communications
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Building a Simple Network
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Understanding the
Host-to-Host
Communications Model
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Understanding Host-to-Host
Communications
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Older model
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– Proprietary
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– Application and combinations software controlled by one
vendor
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Standards-based model
– Multivendor software
– Layered approach
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Why a Layered Network Model?
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Reduces complexity
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Standardizes interfaces
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Facilitates modular engineering
Accelerates evolution
Simplifies teaching and learning
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Ensures interoperable
technology
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The Seven Layers of the OSI Model
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The Seven Layers of the OSI Model (Cont.)
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The Seven Layers of the OSI Model (Cont.)
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The Seven Layers of the OSI Model (Cont.)
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The Seven Layers of the OSI Model (Cont.)
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The Seven Layers of the OSI Model (Cont.)
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The Seven Layers of the OSI Model (Cont.)
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Data Encapsulation
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Data De-Encapsulation
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Peer-to-Peer Communication
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TCP/IP Stack
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Defines four layers
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Uses different names for Layers 1
through 3
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Combines Layers 5 through 7 into
single application layer
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TCP/IP Stack vs. the OSI Model
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Building a Simple Network
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Exploring the
Packet Delivery
Process
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Layer 1 Devices
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Layer 1 provides the physical media and its encoding.
Examples:
– Ethernet
– Serial
– Repeater
– Physical interface of the NIC
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Layer 2 Devices
– Bridge
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– NIC
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Examples:
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Layer 2 devices provide an interface with the physical media.
– Switch
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Layer 2 Addressing
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MAC address
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Assigned to end devices
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Layer 3 Devices and Their Function
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Layer 3 Addressing
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ARP
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ARP Table
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Host-to-Host Packet Delivery (1 of 22)
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Host-to-Host Packet Delivery (2 of 22)
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