O'Reilly logo

Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 5

A1: The new access list causes two hops to be added to every route except 10.33.32.0.
A2: RTB interprets all subnets of 172.16.0.0 according to its misconfigured masks. The consequences, as exhibited in each of the four entries in its route table, are
  • Entry 1: This entry is correct because 172.16.24.0 can be masked with either 22 bits or 23 bits.

  • Entry 2: Subnet 172.16.26.0 is advertised by RTC. Because the 23rd bit of this address is one and RTB is using a 22-bit mask, from RTB's perspective this one appears in the host address space. Therefore, RTB interprets the advertisement of 172.16.26.0 as a host route and marks it with a 32-bit mask in the route table.

  • Entry 3: RTB interprets its interface address 172.16.22.5 as being a member ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required