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Cisco CCNA 200-301 - Domains 1 2 3 Fundamentals Access IP Connectivity

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Question 1

Two Cisco routers are directly connected. Router A has:

```

interface GigabitEthernet0/0

ip address 10.1.1.1 255.255.255.252

```

Router B has:

```

interface GigabitEthernet0/0

ip address 10.1.1.2 255.255.255.252

```

What subnet does this /30 network create and how many usable hosts?

Answer choices

  • A. Network: 10.1.1.0/30, 4 hosts usable

  • B. Network: 10.1.1.0/30, 2 usable hosts (10.1.1.1 and 10.1.1.2) (Correct)

  • C. Network: 10.1.1.0/28, 14 usable hosts

  • D. Network: 10.1.1.0/30, 0 usable hosts

Explanation

/30 = 4 total addresses (2^2=4): 10.1.1.0 (network), 10.1.1.1, 10.1.1.2, 10.1.1.3 (broadcast). Only 2 usable host addresses. /30 subnets are used for point-to-point WAN links and router-to-router connections to conserve IP address space.

Question 2

What is the purpose of the `no shutdown` command on a Cisco router interface?

Answer choices

  • A. Removes the IP address from the interface

  • B. Administratively enables (brings up) the interface — interfaces are in "shutdown" state by default on routers (Correct)

  • C. Resets the interface counters

  • D. Removes any ACLs applied to the interface

Explanation

Cisco router interfaces are administratively DOWN by default (unlike switches where ports are up by default). `no shutdown` administratively enables the interface. The interface status changes from "administratively down" to "up" (assuming physical layer connection is present).

Question 3

An IPv6 address is configured as `2001:0DB8:0000:0000:0000:0000:0000:0001/64`. What is the compressed form of this address?

Answer choices

  • A. `2001:DB8::1/64` (Correct)

  • B. `2001:DB8:0:0::1/64`

  • C. `2001:DB8:::1/64`

  • D. `2001:0DB8::0001/64`

Explanation

IPv6 compression rules: 1) Remove leading zeros in each hextet (0DB8 → DB8, 0000 → 0), 2) Replace ONE longest consecutive sequence of all-zero hextets with :: . `2001:0DB8:0000:0000:0000:0000:0000:0001` → `2001:DB8::1`. Only one :: is allowed.

Question 4

A Cisco switch shows the following MAC address table entry:

```

Vlan Mac Address Type Ports

10 0050.5678.abcd STATIC Gi0/1

```

What does "STATIC" indicate for this MAC address?

Answer choices

  • A. It was learned dynamically but timed out

  • B. It was manually configured or is a port security sticky MAC address (Correct)

  • C. It is a multicast MAC address

  • D. It is the switch's own MAC address

Explanation

MAC addresses in the table can be: DYNAMIC (learned from traffic, ages out), STATIC (manually configured with `mac address-table static` or learned via port security with sticky), or SELF (the switch's own MAC). STATIC entries don't age out.

Question 5

A network engineer needs to summarize the following networks into a single route:

192.168.16.0/24, 192.168.17.0/24, 192.168.18.0/24, 192.168.19.0/24

What is the correct summary route?

Answer choices

  • A. 192.168.16.0/22 (Correct)

  • B. 192.168.0.0/16

  • C. 192.168.16.0/23

  • D. 192.168.16.0/24

Explanation

192.168.16 = .0001 0000, 192.168.17 = .0001 0001, 192.168.18 = .0001 0010, 192.168.19 = .0001 0011. The first 22 bits are common (192.168.16.x where the third octet shares the first 6 bits). Summary: 192.168.16.0/22 covers .16.0 through .19.255 — exactly these 4 networks.