Podcast
Questions and Answers
What is the purpose of the ICMP protocol?
What is the purpose of the ICMP protocol?
To provide feedback about issues related to the processing of IP packets under certain conditions.
What command is used to display the contents of the IP routing tables?
What command is used to display the contents of the IP routing tables?
show ip route
What is the status of the Vlan1 interface?
What is the status of the Vlan1 interface?
Administratively down
What is the IPv6 address of the GigabitEthernet0/0/1 interface?
What is the IPv6 address of the GigabitEthernet0/0/1 interface?
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What is the command used to display statistics for all interfaces?
What is the command used to display statistics for all interfaces?
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What is the description of the GigabitEthernet0/0/0 interface?
What is the description of the GigabitEthernet0/0/0 interface?
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What is the MTU of the GigabitEthernet0/0/0 interface?
What is the MTU of the GigabitEthernet0/0/0 interface?
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What is the bandwidth of the GigabitEthernet0/0/0 interface?
What is the bandwidth of the GigabitEthernet0/0/0 interface?
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What are two ways to learn remote routes in a network?
What are two ways to learn remote routes in a network?
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What is the purpose of a default route in a network?
What is the purpose of a default route in a network?
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What are two characteristics of static routes?
What are two characteristics of static routes?
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What is the advantage of using dynamic routing protocols?
What is the advantage of using dynamic routing protocols?
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What does the 'show ip route' command display in a routing table?
What does the 'show ip route' command display in a routing table?
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What type of route is indicated by the letter 'S' in the routing table?
What type of route is indicated by the letter 'S' in the routing table?
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What is the purpose of the ARP protocol?
What is the purpose of the ARP protocol?
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What type of route is directly connected to the router's interface?
What type of route is directly connected to the router's interface?
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What is a potential issue that can arise from excessive ARP broadcasts?
What is a potential issue that can arise from excessive ARP broadcasts?
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What type of attack can be performed by spoofing ARP replies?
What type of attack can be performed by spoofing ARP replies?
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What type of devices include mitigation techniques to protect against ARP attacks?
What type of devices include mitigation techniques to protect against ARP attacks?
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What command is used to display the contents of the IP routing tables?
What command is used to display the contents of the IP routing tables?
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What command is used to display the IPv6 statistics for all interfaces on a router?
What command is used to display the IPv6 statistics for all interfaces on a router?
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What command is used to view the status of all interfaces, including their IP addresses and current status?
What command is used to view the status of all interfaces, including their IP addresses and current status?
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Study Notes
Routing
- Remote routes are learned manually with a static route or dynamically with a routing protocol
- Default route forwards all traffic to a specific direction when there is no match in the routing table
Static Routing
- Must be configured manually
- Must be adjusted manually by the administrator when there is a change in the topology
- Good for small non-redundant networks
- Often used in conjunction with a dynamic routing protocol for configuring a default route
Dynamic Routing
- Automatically discovers remote networks
- Maintains up-to-date information
- Chooses the best path to the destination
- Finds new best paths when there is a topology change
- Can also share static default routes with other routers
IPv4 Routing Table
- The show ip route command shows the following route sources:
- L - Directly connected local interface IP address
- C - Directly connected network
- S - Static route was manually configured by an administrator
- O - OSPF
- D - EIGRP
ARP
- Address Resolution Protocol (ARP) is used to determine the destination MAC address of a local device when the IPv4 address is known
- Excessive ARP broadcasts can cause a reduction in performance
- ARP replies can be spoofed by a threat actor to perform an ARP poisoning attack
ICMP
- Internet Control Message Protocol (ICMP) provides feedback about issues related to the processing of IP packets under certain conditions
- ICMPv4 and ICMPv6 messages are used for this purpose
Configure Interfaces
- The show ip interface brief and show ipv6 interface brief commands are used to view the status of all interfaces
- The show ip route and show ipv6 route commands are used to display the contents of the IP routing tables
- The show interfaces command is used to display statistics for all interfaces on the device
- The show ip interfaces and show ipv6 interfaces commands are used to display the IPv4 and IPv6 statistics for all interfaces on a router
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Description
Learn about remote routes, static routes, and default routes in computer networking. Understand how routers share information and forward traffic.
