Questions and Answers
What command should be issued to save the router configuration after troubleshooting?
copy running-config startup-config
Which IPv4 header field is responsible for defining the priority of the packet?
differentiated services
What is usually used to acknowledge the data receipt and request the retransmission of missing data in connectionless protocols?
upper-layer connection-oriented protocols
Why is NAT not needed in IPv6?
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Which two interfaces will allow access via the VTY lines to configure the router? (Choose two.)
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What else has to be configured for Internet access if a computer already has an IP address, subnet mask, and DNS server?
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Which three commands are used to set up a password for a person who attaches a cable to a new router? (Choose three.)
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A configured and activated router interface must be connected to another device in order to operate.
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If power to a router is lost and the configuration is not saved, which two types of information will be lost? (Choose two.)
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How do hosts ensure that their packets are directed to the correct network destination?
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What is a service provided by the Flow Label field of the IPv6 header?
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What will the router do immediately after matching the destination IP address to a network on a directly connected routing table entry?
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In a router, ____ is the nonvolatile memory where the diagnostic software, the bootup instructions, and a limited IOS are stored.
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Which two commands can be used on a Windows host to display the routing table? (Choose two.)
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How will a computer send a packet to a destination host in the same LAN?
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Which command displays a summary chart of all router interfaces, their IP addresses, and their current operational status?
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Which two files, if found, are copied into RAM as a router boots up with the default configuration register setting? (Choose two.)
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When would the Cisco IOS image held in ROM be used to boot the router?
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Study Notes
Router Configuration and Commands
- To save a router's configuration for future reboots, use the command
copy running-config startup-config
. - Commands to configure a password for console access include
password cisco
,line console 0
, andlogin
. - The command
show ip interface brief
provides a summary of all router interfaces, their IP addresses, and operational statuses.
Network Protocols and Functionality
- The IPv4 header field for defining priority is known as differentiated services.
- In connectionless protocols, upper-layer connection-oriented protocols are often used to acknowledge data receipt and request retransmission of missing data.
- In IPv6, Network Address Translation (NAT) is unnecessary due to the vast number of available public IPv6 addresses.
Router Interfaces and Connections
- A configured and activated router interface needs to connect to another device to function properly.
- WAN and LAN interfaces facilitate access via VTY lines for router configuration.
Routing and Networking Basics
- For Internet access, a computer must have a configured default gateway address in addition to its IP address, subnet mask, and DNS server.
- Hosts maintain a local routing table including routes to the loopback interface, local networks, and remote default routes to ensure packets reach the correct destination.
IPv6 and Traffic Forwarding
- The Flow Label field in IPv6 headers informs devices to maintain the same path for packets from real-time applications.
- Upon matching a destination IP address to a directly connected routing table entry, the router switches the packet to the corresponding interface.
Memory Types and Information Loss
- In routers, nonvolatile memory where diagnostic software, boot instructions, and a limited IOS are stored is known as ROM.
- If router power is lost and the configuration is unsaved, both the routing table and ARP cache will be lost.
Routing Tables and Network Commands
- To display a routing table on a Windows host, commands
route print
ornetstat -r
can be utilized. - When a computer sends packets within the same LAN, those packets are sent directly to the destination host.
Startup Process in Routers
- Upon booting with the default configuration register setting, a router may copy its startup configuration and IOS image into RAM.
- The Cisco IOS image in ROM is used to boot the router if the full IOS cannot be found.
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Test your knowledge with these flashcards covering key concepts from Chapter 6 of Cisco networking. Topics include router configurations, IPv4 header fields, and more. Ideal for students preparing for networking exams or certifications.