Wednesday, March 9, 2016

CCNAv2 Chapter 6 Review

Greetings, and welcome to Seeseenayy.
Today are some review notes for chapter six.

Chapter 6 Test Review AND Notes
Chapter 6 Static Routing
2/26/2016


Dynamically from routing protocols (OSPF/EIGRP/RIP)

Benefits of Static Routes

  • Route not advertised (Security benefit).
  • Less bandwidth usage than dynamic.
  • Less overhead than dynamic.
  • Lower CPU usage than dynamic.

Downside of Static Routes

  • Very time-consuming to set up for large networks.
  • Requires updates if there’s a topology update or change.
  • Prone to setup errors.

Types of Static Routes
Standard

  • Standard route. No really “different” description.


Default

  • Matches all packets.


Summary

  • Matches multiple networks.


Floating

  • Backup Route
    • (Given a high administrative distance)


Stub Route

  • One direction available to send packets.
    • Known as the “Gateway of Last Resort”.


Route Types, Contd.
The following are considered the 'primary' static routes.

  • Default Static Route
  • Floating Static Route
  • Summary Static Route
  • Recursive Static Route
  • Stub Network Static Route
  • Directly Connected Static Route
  • Fully Specified Static Route
What does the command mean?
ipv6 route 2001:ACAD::/2 2001:ACAD:3000::1
  1. The blue colored text (2001:ACAD::/2) is the destination network.
  2. The purple colored text (2001:ACAD:3000::1) is the "next hop" address (next hop is a recursive route).
To indicate a backup route (floating static route), make the cost (number) higher than the other routes. This would only be used if the original (and less costly) route "dies".


CHAPTER TEST REVIEW





Static Routing vs Dynamic:
  a. Static uses less resources.
  b. No advertising, making it more secure.
  c. Dynamic adjusts automatically to topology changes.

Issues with Static Routing:
  a. Updates manual.
  b. Prone to errors.

Difference between Static Routing and Default Routing:
  a. Static routing is a "pointed" and directed flow for a network, whereas 

Floating Static Route:
  a. FSRs are backup routes. 
      A floating static route is a static route with an administrative distance that we have set. 

What is the Administrative Distance of a static route?
  a. 1 

Recursive Static Routes
  a. A route whose next hop and the destination network are covered by another learned route.

Directly Connected Static Routes
  b. Uses exit interface.

Fully Specified Static Routes
  c. Uses both.

What will "IP Route 172.16.5.0 255.255.255.0 172.16.2.2" look like in the routing table?
  a. S               172.16.5.0 [1/0] via 172.16.2.2
  Route Type   
  Network [AdminDist/Cost] 
  via NextHopAddr (OR Interface) 

We need 50 phones, 70 PC's, 10 Printers, and 10 WIFI device addresses, what is the full network address if our IP address will be 172.16.0.0?
50(+2): 7 bits needed (2^7) = /26
70(+2): /25
10(+2): /28
10(+2): /28

0-127, 128-191, 192-207, 208-223. We use up an entire octet, maxes out at 255. 
The subnet mask that is around ~255 is /24 (our answer), which is 254 hosts, and 256 addresses.

Custom Subnetting IPV4

Addresses:
20.47.168.0/23
20.47.170.0/23
20.47.172.0/23
20.47.174.0/24

If they're the same, don't mess with them. The rule is we count until they're not the same anymore.
The addresses, converted into binary, is:

10101|000
10101|010
10101|100
10101|110

Five bits on the left side, which were two octets, so 8 + 8 = 16, and 16 + 5 = 21. Our subnet is /21.
Yielding our final result; 20.47.168.0/21

Custom Subnetting IPV6

Addresses:
2001:ACAD:1234:4::/64
2001:ACAD:1234:5::/64
2001:ACAD:1234:6::/64
2001:ACAD:1234:7::/64
2001:ACAD:1234:8::/64

Convert the "4" to the "8" to binary, gets you.

0.0.0.0.0.0.0.0.0.0.0.0 | 0100
0.0.0.0.0.0.0.0.0.0.0.0 | 0101
0.0.0.0.0.0.0.0.0.0.0.0 | 0110
0.0.0.0.0.0.0.0.0.0.0.0 | 0111
0.0.0.0.0.0.0.0.0.0.0.0 | 1000

Twelve "0.0.0"'s....
You have three octets out of it:

3 x 16 
  48 
  12   
  60                Yields /60 as a SM.. 60 is the answer.


Three Commands to Troubleshoot Routes
 a. show ip route
 b. show ip interface brief
 c. ping

If you have a static route in a routing table and the outgoing interface is dead/down, what happens?
The route is removed from the routing table.

Oh, boy, pictures.

This Diagram, route it. 

" ip route 192.168.4.0 255.255.255.0 192.168.3.2
Destination IP, which is LAN C, the SM, and the .2 serial address.

This Diagram, route it to make it LEAST RESOURCE INTENSIVE!
So, we just default-route it to s0/0/1, but why use an interface when we can use the IP address?
Well, since we're being efficient with our routing, the RT would need to re-look at the routing table to find the "198.133.219.6/30" address, rather than just pushing it out via the interface.
"ip route 0.0.0.0 0.0.0.0 s0/0/1"

This Diagram, route it!
What command would you use so that both LANs (both switches under R1) may contact the LAN under R2? Static route only.
Easy! Just route it.
"ipv6 route 2001:DB8:1:4::/64 2001:DB8:1:3::2", or if you wanted to, you could replace the next IP address with an interface, which would be S0/0/1. 

This Diagram, route it!

So, what static route would allow R1 to reach all unknown networks on the "INTERNET"?
We need a default route, so enter your ipv6 command. The "default route" in IPV4 is 0.0.0.0 thing, but in IPV6 it is "::/0". 
Since this is IPV6 we will also need to put the next-hop link-local address, which is "fe80::2". 
Your command will be "ipv6 route ::/0 g0/1 fe80::2". 

If you want to put in a static route that goes to the Primary ISP, and another one that goes to the back-up ISP. What do I do?


Easy, just give Branch2 the first IP route for the primary isp:
ip route 0.0.0.0 0.0.0.0 s0/0/0
Then, give Branch2 the second IP route for the Backup ISP, but you'll need to give it AD so it's used as a fall-back of sorts.
 ip route 0.0.0.0 0.0.0.0 s0/1/0 10












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