Refer to the network diagram. Which of the following statements accurately describes a routing entry or network summarization relevant to the Phoenix router's LANs?

Question

Exhibit

Options

• A10.0.0.0/22 is subnetted, 1 subnets 10.0.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
• B10.0.0.0/28 is subnetted, 1 subnets 10.0.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
• C10.0.0.0/20 is subnetted, 1 subnets 10.2.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
• D10.0.0.0/22 is subnetted, 1 subnets 10.4.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
• E10.0.0.0/28 is subnetted, 1 subnets 10.4.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
• F10.0.0.0/30 is subnetted, 1 subnets 10.4.4.4 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1

• A
  7% (3)
• B
  26% (11)
• C
  2% (1)
• D
  52% (22)
• E
  10% (4)
• F
  2% (1)

Explanation

The Phoenix router's LANs are in the 10.4.x.x address space. A /22 subnet mask covers 1,024 addresses (4 Class C blocks), so the summary network 10.4.0.0/22 encompasses 10.4.0.0–10.4.3.255, which correctly summarizes multiple LAN subnets assigned to Phoenix. The routing entry shows this summary being learned via 10.2.0.2 on Serial0/1 with an EIGRP metric. Option A uses the correct /22 mask but the wrong network address (10.0.0.0 instead of 10.4.0.0). Options B and E use /28 (too small). Option C uses /20 (too large) and the wrong network. Option F uses /30 with a host-specific address, which makes no sense for a LAN summary.

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