A network administrator configures a router with the following IP address information:
Gigabit Ethernet 1 Interface: 10.10.0.1/24
Serial 0 Interface: 10.10.0.253/30
Clients are connected to a switch on the gigabit Ethernet interface; the ISP is connected to the Serial 0 interface. When the router configuration is complete and client devices are reconfigured, all clients report that they are unable to connect to the Internet. Which of the following is the MOST likely reason?
A. The router was configured with an incorrect IP address
B. The router was configured with an incorrect default gateway
C. The router was configured with an incorrect subnet mask
D. The router was configured with an incorrect loopback address
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It is C, because Serial 0 Interface uses /30 mask, which is Variable Length Subnet Masking – VLSM.
If Gigabit Ethernet 1 Interface has /24 mask, means that this network will use all the available IPs.
It must has VLSM like /25, /26, /27, /28, /29 or /30. Like this 10.10.0.0 network will be subnetet at few subnets.
Can someone explain to me why it’s C instead of A ?!