N10-009 · Question #212
A network administrator logs on to a router and sees an interface with an IP address of 10.61.52.34 255.255.255.252. Which of the following best describes how this interface IP address is being used?
The correct answer is A. As a point-to-point connection. A subnet mask of 255.255.255.252 (/30) is typically used for point-to-point connections, allocating exactly two usable IP addresses.
Question
A network administrator logs on to a router and sees an interface with an IP address of 10.61.52.34 255.255.255.252. Which of the following best describes how this interface IP address is being used?
Options
- AAs a point-to-point connection
- BTo connect to the internet
- CAs a virtual address for redundancy
- DFor out-of-band management
How the community answered
(20 responses)- A80% (16)
- B10% (2)
- C5% (1)
- D5% (1)
Why each option
A subnet mask of 255.255.255.252 (/30) is typically used for point-to-point connections, allocating exactly two usable IP addresses.
A subnet mask of 255.255.255.252 corresponds to a /30 CIDR block, which allocates only two usable IP addresses per subnet. This configuration is specifically designed for point-to-point links, such as those between two routers, where only two endpoints need IP addresses (one for each interface).
While a router interface might connect to the internet, the /30 subnet mask specifically indicates a point-to-point link rather than just a general internet connection, which could use various subnet sizes.
Virtual addresses for redundancy (like HSRP or VRRP) typically involve a single shared IP address and a larger subnet to accommodate multiple hosts or virtual routers, not a /30 mask.
Out-of-band management can use any valid IP address and subnet, but a /30 mask is primarily characteristic of a direct link between two devices, not an inherent requirement for management purposes.
Concept tested: Subnetting (identifying /30 for point-to-point)
Source: https://learn.microsoft.com/en-us/azure/virtual-wan/virtual-wan-about#ipsec-considerations
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