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NETWORK204 Study Guide Chapter2

NETWORK204 Study Guide Chapter2 - SEMESTER 2 Chapter 2...

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SEMESTER 2 Chapter 2 Static Networking V 4.0 1.1.1 What are the common components between a router and other computers? CPU, RAM, ROM, Operating System What does a router connect? A router connects multiple networks. What does a router do with each packet it receives? When a router receives an IP packet on one interface, it determines which interface to use to forward the packet onto its destination. What are the 2 types of connections to a router interface? Local Area Networks (LANs) and Wide Area Networks (WANs). What are the two primary functions of a router? Determining the best path to send packets Forwarding packets toward their destination What address does the router use to compare to the routing table? When the router receives a packet, it examines its destination IP address and searches for the best match with a network address in the router's routing table. What two processes are used by a router to learn about remote networks and build their routing tables? Static routes and dynamic routing protocols are used by routers to learn about remote networks and build their routing tables. 1.1.2 What are the five components common to all routers? Fan, Power Supply, Shield for WIC or HWIC, RAM or SDRAM, NVRAM, CPU and AIM List the 5 different components stored in RAM. Operating System: The Cisco IOS (Internetwork Operating System) is copied into RAM during bootup. Running Configuration File: This is the configuration file that stores the configuration commands that the router IOS is currently using. With few exceptions, all commands configured on the router are stored in the running configuration file, known as running-config. IP Routing Table: This file stores information about directly connected and remote networks. It is used to determine the best path to forward the packet. ARP Cache: This cache contains the IPv4 address to MAC address mappings, similar to the ARP cache on a PC. The ARP cache is used on routers that have LAN interfaces such as Ethernet interfaces. Packet Buffer: Packets are temporarily stored in a buffer when received on an interface or before they exit an interface. What happens to the information in RAM if the router RAM is volatile memory and loses its content when the router is powered down or restarted.
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looses power? What are the permanent storage areas in a router? ROM, NVRAM, Flash What 3 things are stored in ROM? The bootstrap instructions Basic diagnostic software Scaled-down version of IOS What is stored in flash? Flash is used as permanent storage for the operating system, Cisco IOS. What happens to flash memory when the power is lost? Flash memory does not lose its contents when the router loses power or is restarted. What is stored in NVRAM? NVRAM is used by the Cisco IOS as permanent storage for the startup configuration file (startup- config).
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