Flashcards in Chapter 4 1220 Routing Deck (30):
What does a router do?
A router connects one network to another network.
What does a router use to move packet?
What is Random Access Memory (RAM)
Provides temporary storage for various applications and processes
What is Read-Only Memory (ROM)
Provides permanent storage for bootup instructions, basic diagnostic software
What is Non-Volatile Random Access Memory (NVRAM)
Provides permanent storage for the startup configuration file (startup-config). NVRAM is non-volatile and does not lose its contents when power is turned off.
What is Flash
Provides permanent storage for the IOS and other system-related files. The IOS is copied from flash into RAM during the bootup process.
What is the 2 primary function of a router?
Determine the best path to send packets
Forward packets toward their destination
What are the 3 packet-forward mechanisms?
Cisco Express Forwarding (CEF) - is the most recent and preferred Cisco IOS packet-forwarding mechanism. Like fast switching, CEF builds a Forwarding Information Base (FIB), and an adjacency table.
What does show ip interface brief
Displays a summary for all interfaces including the IPv4 address of the interface and current operational status.
What does show ip route
Displays the contents of the IPv4 routing table stored in RAM
What does show running-config interface
Displays the commands configured on the specified interface.
What does show ipv6 interface brief
Displays a summary for each of the interfaces.
What does show ipv6 interface gigabitethernet 0/0
displays the interface status and all of the IPv6 addresses belonging to the interface. Along with the link local address and global unicast address
What does show ipv6 route
verifies that IPv6 networks and specific IPv6 interface addresses have been installed in the IPv6 routing table.
In the routing table, what is Local Route interfaces
Added when an interface is configured and active.
In the routing table what is Directly connected interfaces
Added to the routing table when an interface is configured and active.
In the routing table what is Static routes
Added when a route is manually configured and the exit interface is active.
In the routing table what is Dynamic routing protocol
Added when routing protocols that dynamically learn about the network, such as EIGRP or OSPF, are implemented and networks are identified.
What is the "L" code in the routing table?
Identifies the address assigned to a router’s interface. This allows the router to efficiently determine when it receives a packet for the interface instead of being forwarded.
What is the "C" code in the routing table?
Identifies a directly connected network.
What is the "S" code in the routing table?
Identifies a static route created to reach a specific network.
What is the "D" code in the routing table?
Identifies a dynamically learned network from another router using EIGRP.
What is the "O" code in the routing table?
Identifies a dynamically learned network from another router using the OSPF routing protocol.
What is a "Route Source" in the routing table
Identifies how the route was learned.
What is a "Destination Network" in the routing table
Identifies the address of the remote network.
What is a "Administrative distance" in the routing table
Identifies the trustworthiness of the route source. Lower values indicate preferred route source.
What is a "Metric" in the routing table
Identifies the value assigned to reach the remote network. Lower values indicate preferred routes.
What is a "Next Hope" in the routing table
Identifies the IPv4 address of the next router to forward the packet to.
What is a "Route timestamp" in the routing table
Identifies how much time has passed since the route was learned.