3.3 IP Services

What this section tests

Section 3.3 covers the support services of the routed network. Bad time breaks logs and certificates. Bad NAT breaks return traffic. Bad first-hop redundancy breaks hosts. Bad multicast breaks one-to-many traffic.

For each topic, name the control point and the proof command:

• NTP and PTP: the control point is the time source and the sync state. Proof: show ntp associations.
• NAT and PAT: the control point is the translation table. Proof: show ip nat translations.
• HSRP and VRRP: the control point is the virtual gateway and the active device. Proof: show standby brief.
• Multicast: the control point is the multicast tree and the RPF check. Proof: show ip mroute.

Study order

1. NTP and PTP configuration interpretation
2. NAT and PAT
3. HSRP and VRRP
4. Multicast protocols

Pass check

You are ready for section 3.3 when you can do these things:

• Read NTP association output and name the selected source and stratum.
• Configure static NAT, dynamic NAT, and PAT and prove each with the translation table.
• Build an HSRP pair and test failover with tracking.
• Explain the RPF check and the role of the RP in PIM Sparse Mode.