Question 1
Workstation A has been assigned an IP address of 192.0.2.24/28. Workstation B has been assigned an IP address of 192.0.2.100/28. The two workstations are connected with a straight-through cable. Attempts to ping between the hosts are unsuccessful. What two things can be done to allow communications between the hosts? (Choose two)
A. Replace the straight-through cable with a crossover cable.
B. Change the subnet mask of the hosts to /25.
C. Change the subnet mask of the hosts to /26.
D. Change the address of Workstation A to 192.0.2.15.
E. Change the address of Workstation B to 192.0.2.111.
Answer: A B
Explanation
To specify when we use crossover cable or straight-through cable, we should remember:
Group 1: Router, Host, Server
Group 2: Hub, Switch
One device in group 1 + One device in group 2: use straight-through cable
Two devices in the same group: use crossover cable
-> To connect two hosts we must use crossover cable -> A is correct.
With the subnet mask of /28, 192.0.2.24 & 192.0.2.100 will be in different subnets (192.0.2.24 belongs to subnet 192.0.2.16/28; 192.0.2.100 belongs to subnet 192.0.2.96). To make them in the same subnet we need more space for host. Because 100 < 128 so we the suitable subnet should be /25.
Question 2
Your ISP has given you the address 223.5.14.6/29 to assign to your router’s interface. They have also given you the default gateway address of 223.5.14.7. After you have configured the address, the router is unable to ping any remote devices. What is preventing the router from pinging remote devices?
A. The default gateway is not an address on this subnet.
B. The default gateway is the broadcast address for this subnet.
C. The IP address is the broadcast address for this subnet.
D. The IP address is an invalid class D multicast address.
Answer: B
Explanation
For the network 223.5.14.6/29:
Increment: 8
Network address: 223.5.14.0
Broadcast address: 223.5.14.7
-> The default gateway IP address is the broadcast address of this subnet -> B is correct.
Question 3
Refer to the exhibit. According to the routing table, where will the router send a packet destined for 10.1.5.65?
Network Interface Next-hop
10.1.1.0/24 e0 directly connected
10.1.2.0/24 e1 directly connected
10.1.3.0/25 s0 directly connected
10.1.4.0/24 s1 directly connected
10.1.5.0/24 e0 10.1.1.2
10.1.5.64/28 e1 10.1.2.2
10.1.5.64/29 s0 10.1.3.3
10.1.5.64/27 s1 10.1.4.4
A. 10.1.1.2
B. 10.1.2.2
C. 10.1.3.3
D. 10.1.4.4
Answer: C
Explanation
The destination IP address 10.1.5.65 belongs to 10.1.5.64/28, 10.1.5.64/29 & 10.1.5.64/27 subnets but the “longest prefix match” algorithm will choose the most specific subnet mask -> the prefix “/29” will be chosen to route the packet. Therefore the next-hop should be 10.1.3.3 -> C is correct.
Question 4
Refer to the exhibit. The user at Workstation B reports that Server A cannot be reached. What is preventing Workstation B from reaching Server A?
subnetting_gateway.jpg
A. The IP address for Server A is a broadcast address.
B. The IP address for Workstation B is a subnet address.
C. The gateway for Workstation B is not on the same subnet.
D. The gateway for Server A is not on the same subnet.
Answer: D
Question 5
Given the address 192.168.20.19/28, which of the following are valid host addresses on this subnet? (Choose two)
A. 192.168.20.29
B. 192.168.20.16
C. 192.168.20.17
D. 192.168.20.31
E. 192.168.20.0
Answer: A C
Question 6
Which of the following IP addresses fall into the CIDR block of 115.64.4.0/22? (Choose three)
A. 115.64.8.32
B. 115.64.7.64
C. 115.64.6.255
D. 115.64.3.255
E. 115.64.5.128
F. 115.64.12.128
Answer: B C E
Question 7
The Ethernet networks connected to router R1 in the graphic have been summarized for router R2 as 192.1.144.0/20. Which of the following packet destination addresses will R2 forward to R1, according to this summary? (Choose two)
IP_summarize.jpg
A. 192.1.159.2
B. 192.1.160.11
C. 192.1.138.41
D. 192.1.151.254
E. 192.1.143.145
F. 192.1.1.144
Answer: A D
คำถาม 1เวิร์กสเตชัน A ได้ถูกกำหนดอยู่ IP ของ 192.0.2.24/28 เวิร์กสเตชัน B ได้ถูกกำหนดอยู่ IP ของ 192.0.2.100/28 เวิร์กสเตชันที่สองเชื่อมต่อ ด้วยสายเคเบิลโดยตรง ความพยายามในการแก้ไขระหว่างโฮสต์จะไม่สำเร็จ สิ่งสองสิ่งสามารถทำให้ติดต่อสื่อสารระหว่างโฮสต์หรือไม่ (เลือก 2)อ.แทนสายตรง ด้วยสายเคเบิลแบบไขว้B. เปลี่ยน subnet mask ของโฮสต์เพื่อ /25ค.เปลี่ยน subnet mask ของโฮสต์เพื่อ /26D. เปลี่ยนอยู่ของเวิร์กสเตชัน A 192.0.2.15E. เปลี่ยนอยู่ของเวิร์กสเตชัน B 192.0.2.111คำตอบ: Bอธิบายระบุเมื่อใช้สายเคเบิลแบบไขว้หรือสายตรง เราควรจำไว้ว่า:กลุ่มที่ 1: เราเตอร์ โฮสต์ เซิร์ฟเวอร์กลุ่มที่ 2: ฮับ สวิตช์อุปกรณ์หนึ่งในอุปกรณ์กลุ่ม 1 + หนึ่งในกลุ่มที่ 2: ใช้สายตรงอุปกรณ์สองชิ้นเดียว: ใช้สายเคเบิลแบบไขว้-> การเชื่อมต่อสองโฮสต์ที่เราต้องใช้สายเคเบิลแบบไขว้ -> A ถูกต้องด้วยมาสก์ของ /28, 192.0.2.24 และ 192.0.2.100 จะอยู่ในเครือข่ายย่อยต่าง ๆ (192.0.2.24 เป็นของเครือข่าย 192.0.2.16/28; 192.0.2.100 เป็นเครือข่ายย่อย 192.0.2.96) ในเครือข่ายย่อยเดียวกันให้ เราต้องเพิ่มพื้นที่ว่างสำหรับโฮสต์ เพราะ 100 < 128 ดังนั้นเราควรมีเครือข่ายย่อยที่เหมาะ สม/25คำถาม 2Your ISP has given you the address 223.5.14.6/29 to assign to your router’s interface. They have also given you the default gateway address of 223.5.14.7. After you have configured the address, the router is unable to ping any remote devices. What is preventing the router from pinging remote devices?A. The default gateway is not an address on this subnet.B. The default gateway is the broadcast address for this subnet.C. The IP address is the broadcast address for this subnet.D. The IP address is an invalid class D multicast address.Answer: BExplanationFor the network 223.5.14.6/29:Increment: 8Network address: 223.5.14.0Broadcast address: 223.5.14.7-> The default gateway IP address is the broadcast address of this subnet -> B is correct.Question 3Refer to the exhibit. According to the routing table, where will the router send a packet destined for 10.1.5.65?Network Interface Next-hop10.1.1.0/24 e0 directly connected10.1.2.0/24 e1 directly connected10.1.3.0/25 s0 directly connected10.1.4.0/24 s1 directly connected10.1.5.0/24 e0 10.1.1.210.1.5.64/28 e1 10.1.2.210.1.5.64/29 s0 10.1.3.310.1.5.64/27 s1 10.1.4.4A. 10.1.1.2B. 10.1.2.2C. 10.1.3.3D. 10.1.4.4Answer: CExplanationThe destination IP address 10.1.5.65 belongs to 10.1.5.64/28, 10.1.5.64/29 & 10.1.5.64/27 subnets but the “longest prefix match” algorithm will choose the most specific subnet mask -> the prefix “/29” will be chosen to route the packet. Therefore the next-hop should be 10.1.3.3 -> C is correct.Question 4Refer to the exhibit. The user at Workstation B reports that Server A cannot be reached. What is preventing Workstation B from reaching Server A?subnetting_gateway.jpgA. The IP address for Server A is a broadcast address.B. The IP address for Workstation B is a subnet address.C. The gateway for Workstation B is not on the same subnet.D. The gateway for Server A is not on the same subnet.Answer: DQuestion 5Given the address 192.168.20.19/28, which of the following are valid host addresses on this subnet? (Choose two)A. 192.168.20.29B. 192.168.20.16C. 192.168.20.17D. 192.168.20.31E. 192.168.20.0Answer: A CQuestion 6Which of the following IP addresses fall into the CIDR block of 115.64.4.0/22? (Choose three)A. 115.64.8.32B. 115.64.7.64C. 115.64.6.255D. 115.64.3.255E. 115.64.5.128F. 115.64.12.128Answer: B C EQuestion 7The Ethernet networks connected to router R1 in the graphic have been summarized for router R2 as 192.1.144.0/20. Which of the following packet destination addresses will R2 forward to R1, according to this summary? (Choose two)IP_summarize.jpgA. 192.1.159.2B. 192.1.160.11C. 192.1.138.41D. 192.1.151.254E. 192.1.143.145F. 192.1.1.144Answer: A D
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