I met a question on the CCNA exam which I got wrong and even though I found it on different websites with a few explanations available, I'm still confused about it.

The question is about what arp entry will a host have in its arp table after a successful ping to a another host on a different router. Now, through all my CCNA studies so far I've always been taught that the IP source and destination addresses do not change in the packet during the routing process, but only the MAC source and destination addresses change. However, the correct answer was indicating that both the IP and MAC addresses of the gateway were present in the arp table of the sending host, and no sign of host B.

This got me confused. And if this is the case, how will the default-gateway router know the destination IP of the other host? It's probably just a tricky question but still... Any clear thoughts on that?

CCNA IP routing - arp issue

I am reading book 'CCNA Routing and Switching Study Guide - Lammle, Todd' wherein there was a command to create an interface (int f0/0).

On CISCO Router command when I am giving a command Corp(Config)#int f0/0

It is displaying error message as "Invalid interface type and number". Please help me with this command.

CISCO Router Interface Commands

I am new to GNS3 and Cisco's Packet Tracer. Besides using GNS3 to simulate complex networks, practice using it for the CCNA exam, and using Dynamips emulation software to simulate Cisco IOS, how is it used in the real world by big companies and corporations?

What can GNS3 and Packet Tracer be used for besides simulations?

Thru my research on CCNP course, while sniffing EIgrp packets, I noticed that packets have IP TTL of two. I additionally validated this for rip. OSPF doesn't have this assets when you consider that it's link state.

Why does the EIGRP and rip have IP TTL of 2?

I already asked one CCIE man or woman, however he did not know.

I came to trust that this could have something to do with frame relay hub&spoke topologies. For example hub routing EIGRP multicasts from one spoke to every other (assuming subinterfaces)?

Why is EIGRP and RIP uses IP TTL of 2 (CISCO)?

I want help with simple configuration on devices (switches, routers, and PCs) on cisco packet tracer. Any idea?

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