This 200-301 practice question tests your understanding of connected to r1. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
R1#show running-config Building configuration... hostname R1 ! interface GigabitEthernet0/0 ip address 192.0.2.1 255.255.255.0 ipv6 address 2001:db8:1::/64 eui-64 no shutdown ! interface GigabitEthernet0/1 ip address 198.51.100.1 255.255.255.0 ipv6 address 2001:db8:2::1/64 no shutdown ! ip route 0.0.0.0 0.0.0.0 192.0.2.254 ! end R2#show running-config Building configuration... hostname R2 ! interface GigabitEthernet0/0 ip address 192.0.2.2 255.255.255.252 ipv6 address 2001:db8:1::2/64 no shutdown ! interface GigabitEthernet0/1 ip address 203.0.113.1 255.255.255.0 no shutdown ! end R1#show ip interface brief Interface IP-Address OK? Method Status Protocol GigabitEthernet0/0 192.0.2.1 YES manual up up GigabitEthernet0/1 198.51.100.1 YES manual up up R1#ping 192.0.2.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.0.2.2, timeout is 2 seconds: ..... Success rate is 0 percent (0/5) R1#ping 2001:db8:1::2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:db8:1::2, timeout is 2 seconds: ..... Success rate is 0 percent (0/5)
You are connected to R1. Configure IPv4 and IPv6 addressing on R1's interfaces and verify reachability to R2. The current configuration has a wrong subnet mask on G0/0, missing default gateway for IPv4, and R2's IPv6 address is statically assigned with EUI-64. Fix these issues so that R1 can ping both R2's IPv4 and IPv6 addresses.
Correct answer & explanation
The problem had three issues: (1) R1's G0/0 subnet mask was /24 (255.255.255.0) but R2's G0/0 was /30 (255.255.255.252), causing an IP subnet mismatch. (2) R1 lacked a default gateway for IPv4; the static route pointed to 192.0.2.254 which is not reachable. (3) R1's IPv6 EUI-64 configuration on G0/0 generates an interface ID from the MAC, but R2 expects a static address 2001:db8:1::2/64, so R1 must use a static IPv6 address on the same subnet. The fix: change R1's G0/0 mask to /30, add a default route via R2's G0/0 IP (192.0.2.2), and configure a static IPv6 address (e.g., 2001:db8:1::1/64) on R1's G0/0.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Common exam traps
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 200-301 subnetting questions on CIDR, address ranges, and subnet selection.
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
CIDR notation defines the prefix length.
Common exam trap: usable hosts are not the same as total addresses: Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 200-301 subnetting questions on CIDR, address ranges, and subnet selection.
CIDR notation defines the prefix length.
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