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Here is the info given but a production router that does IPv4 BGP only, as of 2021 October 5:
1547576 RIB nodes, using 142 MiB of memory
1687609 BGP routes, using 103 MiB of memory
8 Static routes, using 384 bytes of memory
1687601 Adj-In entries, using 52 MiB of memory
14 Adj-Out entries, using 560 bytes of memory
280025 BGP attributes, using 15 MiB of ...
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(A) What does the mean two router connected by PPP(point to protocol)? As per as my understanding two routers are directly connected.
Routers (or any nodes) may be connected using PPP. PPP uses an underlying simple serial interface like RS-232 and provides data link layer functionality required by IP (data framing).
(B) Why if the two routers connected by ...
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If Router B is disconnected, the interface on Router A goes down because there is no connection. When an interface is down, it has no address, so the address is withdrawn from any routing tables.
You could do something like put a switch between the routers. When Router B is disconnected, Router A would still have a connection on that interface, and the ...
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The router has two interfaces— one on each network. Each host is configured with the default gateway set to the address of the router interface.
Traffic to the other network will be sent to the router, which will forward it to the destination.
Note that the Ip packet has the destination address of the host, and that never changes.
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The /30 subnet mask provides the most efficient use of IP addresses by not wasting any IP addresses when it is applied to a point to point network connection.
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WiFi uses considerably less transmitting power (<100 mW) than cellular phones (up to 8 W). The radiation health risks are accordingly much lower to non-existent (in comparison to radiation from other nearby sources).
Some portable devices may reduce power even when actively transmitting actively when the connection is good enough, but there's no standard.
...
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"Flooding" means LSA is sent to all routers in the area (not just the given network), whereas multicasting means the OSPF pkt (with LSA in it) is listened to by all OSPF routers on the given network (not the the whole area).
Unicasting would require more packets, so it would be less efficient. (224.0.0.9 is for RIPv2 BTW, not OSPF; "all OSPF ...
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There is no problem migrating from an ERL3 to an ER4 because interfaces names between these routers are the same.
After migration, we have to manually create the interface eth3 (because eth3 doesn't exist on EdgeRouter Lite) like this :
configure
set interfaces ethernet eth3 speed auto
set interfaces ethernet eth3 duplex auto
commit
save
After that, reboot ...
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For hosts on one network to talk to another network, you require a gateway/router in between and the hosts to have (default) routes that point directly or indirectly to the remote network.
You can have all hosts use their local router as default gateway, interconnect the routers and set up a static route on each router for the remote network. Alternatively, ...
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Why can't we say router works both at Layer 2 and Layer 3?
This is implied. Basically, when we say that a device works on layer N, we actually means that the device implements all layers up to including layer N of the model, and its main functionality is in layer N.
The logic is as follows. The role of a device, that interacts with a network, is to send &...
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This question is kinda impossible to answer. Different protocols use different means of transmitting its data.
OSPF uses IP, RIP uses IP/UDP, IS-IS uses layer 2 directly. Also, addresses on multicast-capable links are different.
(A) and (B) are already answered.
(C) What does the mean that two routers are connected via ethernet? As per as my understanding ...
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