cnp3-ebook/exercises/routing-policies

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12 ../../exercises/routing-policies.rst:141

	English Should `AS123` change its configuration ? 41/10000 · 41
13 ../../exercises/routing-policies.rst:143

	English Consider that the AS stub (`AS456`) shown in the figure below decides to advertise two ``/48`` prefixes instead of its allocated ``/47`` prefix. 144/10000 · 144
14 ../../exercises/routing-policies.rst:151

	English Via which provider does `AS456` receive the packets destined to ``2001:db8:caff::bb`` and ``2001:db8:cafe::aa`` ? 113/10000 · 113
15 ../../exercises/routing-policies.rst:153

	English How is the reachability of these addresses affected when link `R1`-`R3` fails ? 79/10000 · 79
16 ../../exercises/routing-policies.rst:155

	English 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. 209/10000 · 209
17 ../../exercises/routing-policies.rst:157

	English 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. 424/10000 · 424
18 ../../exercises/routing-policies.rst:163

	English A simple network 16/10000 · 16
19 ../../exercises/routing-policies.rst:165

	English 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 ? 310/10000 · 310
20 ../../exercises/routing-policies.rst:167

	English A ``traceroute6`` towards ``ipv6.google.com`` provides the following output : 77/10000 · 77
21 ../../exercises/routing-policies.rst:191

	English Can you explain why at the eighth, ninth and tenth hopes several IPv6 addresses are reported in the ``traceroute6`` output ? 124/10000 · 124
22 ../../exercises/routing-policies.rst:193

	English `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``. 318/10000 · 318
23 ../../exercises/routing-policies.rst:195

	English `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 : 229/10000 · 229
24 ../../exercises/routing-policies.rst:197

	English ``Code==0`` 11/10000 · 11
25 ../../exercises/routing-policies.rst:213

	English An ICMPv6 error message includes in its message body the beginning of the IPv6 packet that triggered this error. How many bytes of the original packet must be returned to allow the host to recover the original source and destination addresses and source and destination ports of the packet that caused the error ? 313/10000 · 313
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