XK0-004 · Question #270
A server administrator notices that one of the servers cannot connect to its gateway, which has the IP 10.10.10.1. Which of the following commands should the administrator execute to determine the def
The correct answer is A. route -n. The route -n command displays the kernel IP routing table in numeric form, including the default gateway entry (destination 0.0.0.0), making it the correct tool to identify the configured default gateway.
Question
A server administrator notices that one of the servers cannot connect to its gateway, which has the IP 10.10.10.1. Which of the following commands should the administrator execute to determine the default gateway of the server?
Options
- Aroute -n
- Bip a default-gw
- Cifconfig
- Dnslookup
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(33 responses)- A94% (31)
- B3% (1)
- D3% (1)
Why each option
The route -n command displays the kernel IP routing table in numeric form, including the default gateway entry (destination 0.0.0.0), making it the correct tool to identify the configured default gateway.
route -n reads the kernel routing table and prints it without performing DNS lookups (-n flag). The default gateway appears as a route with destination 0.0.0.0 and a Gateway column showing the gateway IP (10.10.10.1 in this scenario), directly answering whether the server has a correct gateway configured.
ip a default-gw is not a valid command; ip a (ip addr) only shows interface address information and does not accept a default-gw subcommand.
ifconfig displays interface-level configuration such as IP addresses and MAC addresses but does not show routing table entries or the default gateway.
nslookup is a DNS query tool used to resolve hostnames; it provides no information about the system's routing table or default gateway setting.
Concept tested: Linux routing table inspection with route -n
Source: https://man7.org/linux/man-pages/man8/route.8.html
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