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Lab nf-11 - Troubleshooting Layer 1 / 2 / 3 Symptoms
When the network breaks, the engineer who fixes it first is the one with a method. Trial-and-error works on the
6 min read
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Lab nf-10 - GRE Tunnel Between Two Routers
GRE - Generic Routing Encapsulation - is the lightest-weight tunnel encapsulation in widespread use. It takes an IP packet, wraps
6 min read
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Lab nf-09 - Configure PPP and CHAP on a Serial Link
PPP - Point-to-Point Protocol - is the WAN encapsulation that survived. Frame Relay died, X.25 died, ATM mostly died,
5 min read
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Lab nf-03 - IPv4 Addressing Essentials
Every IP packet on the planet starts and ends with two 32-bit numbers - the source and destination addresses. CCNA
7 min read
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Lab nf-07 - Static Routes: Next-Hop vs Exit-Interface
A static route on a Cisco router can be written two ways: with a next-hop IP address, or with an
6 min read
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Lab nf-06 - Configure ARP and Static ARP
ARP - the Address Resolution Protocol - is the unsung mechanism that makes Layer 3 routing actually work over Layer
6 min read