FAQS

• July 4, 2023 Can you configure different MTU for subinterfaces under the same main interface? How do 7500/GSR/ESR routers behave in this scenario?
• July 4, 2023 What is the difference between point-to-point subinterfaces and multi-point subinterfaces?
• July 4, 2023 What is the purpose of ports 2228 and 56506?
• July 4, 2023 What is the difference between the two methods to create static routes?
• July 4, 2023 How do I connect two different ISPs and route different traffic to different ISPs?
• July 4, 2023 What is Virtual Routing and Forwarding (VRF)?
• July 4, 2023 Can a VLAN interface and a tunnel interface have the same IP address?
• July 4, 2023 What is the Pause control counter?
• July 4, 2023 What are the maximum number of secondary IP addesses that can be configured on a router interface?
• July 4, 2023 Who does load-balancing when there are multiple links to a destination, Cisco Express Forwarding (CEF), or the routing protocol?
• July 4, 2023 What is Unicast Reverse Path Forwarding (uRPF)? Can a default route 0.0.0.0/0 be used to perform a uRPF check?
• July 4, 2023 I have four equal cost parallel paths to the same destination. I am doing fast switching on two links and process switching on the other two. How will the packets be routed in this situation?
• July 4, 2023 Is there a performance advantage when using the the IP access list keyword established on an extended ACL? Does using “established” make the access list more vulnerable? Do you have specific examples of the usage?
• July 4, 2023 I have primary and secondary IP addresses configured on an Ethernet interface and my router is running RIP (a distance vector routing protocol). How does split-horizon affect the routing updates?
• July 4, 2023 Is it possible to have duplicate ip addresses for two serial interfaces that belong to the same router?
• July 4, 2023 Can I configure two interfaces in the same subnet (t0 = 142.10.46.250/24 and t1 142.10.46.251/24)?
• July 4, 2023 Can an interface have more than one ip access-group statement in its configuration?
• July 4, 2023 Would it be possible to configure a router for a 255.255.254.0 Ethernet and a 255.255.252.0 serial subnet? Does IGRP/RIPv1 support variable subnetting?
• July 4, 2023 Does the interface subcommand no arp arpa disable the Address Resolution Protocol (ARP) function for a router interface?
• July 4, 2023 Does the use of extended IP access control lists (ACLs) filter regular routing updates (such as OSPF)? Do I need to explicitly permit the multicast IPs used by routing protocols (such as 224.0.0.5 and 224.0.0.6, in the case of OSPF) for updates to ensure the proper working of routing protocols?