@@ -60,7 +60,7 @@ use within their networks and on how metrics should be assigned to links
6060in their network. Because of this independence, each provider’s network
6161is usually a single *autonomous system * (AS). We will define this term
6262more precisely in a later section, but for now it is adequate to think
63- of an AS as a network that is administered independently of other ASs .
63+ of an AS as a network that is administered independently of other ASes .
6464
6565The fact that the Internet has a discernible structure can be used to
6666our advantage as we tackle the problem of scalability. In fact, we need
@@ -209,7 +209,7 @@ improving scalability, the AS model decouples the intradomain routing
209209that takes place in one AS from that taking place in another. Thus, each
210210AS can run whatever intradomain routing protocols it chooses. It can
211211even use static routes or multiple protocols, if desired. The
212- interdomain routing problem is then one of having different ASs share
212+ interdomain routing problem is then one of having different ASes share
213213reachability information—descriptions of the set of IP addresses that
214214can be reached via a given AS—with each other.
215215
@@ -320,8 +320,8 @@ able to forward any packet destined anywhere in the Internet. That means
320320having a routing table that will provide a match for any valid IP
321321address. While CIDR has helped to control the number of distinct
322322prefixes that are carried in the Internet’s backbone routing, there is
323- inevitably a lot of routing information to pass around—roughly 700,000
324- prefixes in mid-2018 .
323+ inevitably a lot of routing information to pass around—the number of
324+ prefixes has exceeded one million by 2025 .
325325
326326A further challenge in interdomain routing arises from the autonomous
327327nature of the domains. Note that each domain may run its own interior
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