cnp3-ebook - English @ Weblate: Consider the interdomain topology shown in the figure below. Assuming, …

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Consider the interdomain topology shown in the figure below. Assuming, that `AS1` advertises prefix ``2001:db8:1::/48``,  `AS2` prefix ``2001:db8:2::/48``, ... compute the routing tables of the different ASes.

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	English	Actions
	Inter-domain routing
	Exercises
	Consider the interdomain topology shown in the figure below.
	In this network, what are the paths :
	from `AS1` to `AS4`
	from `AS4` to `AS2`
	from `AS4` to `AS1`
	Consider the interdomain topology shown in the figure below. Assuming, that `AS1` advertises prefix ``2001:db8:1::/48``, `AS2` prefix ``2001:db8:2::/48``, ... compute the routing tables of the different ASes.
	Are all ASes capable of reaching all the other ASes in this simple Internet ?
	In this internet, some ASes cannot reach all other ASes. Can you fix the problem by adding one shared-cost peering link or one customer-provider peering link ?
	Consider the network below in which a stub domain, `AS456`, is connected to two providers `AS123` and `AS789`. `AS456` advertises its prefix to both its providers. On the other hand, `AS123` advertises ``2001:db8:dead::/48`` while `AS789` advertises ``2001:db8:beef::/48`` and ``2001:db8:dead:cafe::/63``. Via which provider will the packets destined to ``2001:db8:dead:cafe::1`` will be received by `AS456` ?
	Should `AS123` change its configuration ?
	Consider that the AS stub (`AS456`) shown in the figure below decides to advertise two ``/48`` prefixes instead of its allocated ``/47`` prefix.
	Via which provider does `AS456` receive the packets destined to ``2001:db8:caff::bb`` and ``2001:db8:cafe::aa`` ?
	How is the reachability of these addresses affected when link `R1`-`R3` fails ?
	Propose a configuration on R1 that achieves the same objective as the one shown in the figure but also preserves the reachability of all IP addresses inside `AS456` if one of `AS456`'s interdomain links fails.
	Consider the network shown below. In this network, the metric of each link is set to `1` except link `A-B` whose metric is set to `4` in both directions. In this network, there are two paths with the same cost between `D` and `C`. Old routers would randomly select one of these equal cost paths and install it in their forwarding table. Recent routers are able to use up to `N` equal cost paths towards the same destination.
	A simple network
	On recent routers, a lookup in the forwarding table for a destination address returns a set of outgoing interfaces. How would you design an algorithm that selects the outgoing interface used for each packet, knowing that to avoid reordering, all segments of a given TCP connection should follow the same path ?
	A ``traceroute6`` towards ``ipv6.google.com`` provides the following output :
	Can you explain why at the eighth, ninth and tenth hopes several IPv6 addresses are reported in the ``traceroute6`` output ?
	`Section 3.3 <https://tools.ietf.org/html/rfc4443#section-3.3>`_ of :rfc:`4443` explains two different reasons why an IPv6 enabled device could generate an ICMPv6 Time Exceeded message. Explain when a router could generate such a message with ``Code==0`` and when a host could generate such a message with ``Code==1``.
	`Section 3.1 <https://tools.ietf.org/html/rfc4443#section-3.1>`_ of :rfc:`4443` seven different Codes for the ICMPv6 Destination Unreachable Message. Under which circumstances would a router generate such an ICMPv6 message with :

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35564 String information

Component

cnp3-ebook/exercises/routing-policies

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read-only

Source string location

../../exercises/routing-policies.rst:63 • ../../exercises/routing-policies.rst:96

String age

4 years ago

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a month ago

Source string age

4 years ago

Translation file

locale/pot/exercises/routing-policies.pot, string 8

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