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Exam 200-301 topic 1 question 1295 discussion

Actual exam question from Cisco's 200-301

Question #: 1295
Topic #: 1

SIMULATION
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Guidelines
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This is a lab item in which tasks will be performed on virtual devices

• Refer to the Tasks tab to view the tasks for this lab item.
• Refer to the Topology tab to access the device console(s) and perform the tasks
• Console access is available for all required devices by clicking the device icon or using the tab(s) above the console window
• All necessary preconfigurations have been applied
• Do not change the enable password or hostname for any device
• Save your configurations to NVRAM before moving to the next item
• Click Next at the bottom of the screen to submit this lab and move to the next question
• When Next is clicked the lab closes and cannot be reopened

Topology
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Tasks
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All physical cabling is in place. A company plans to deploy 16 new sites. The sites will utilize both IPv4 and IPv6 networks.

1. Subnet 10.20.0.0/16 to meet the subnet requirements and maximize the number of hosts
• Using the second subnet
- Assign the first usable IP address to e0/0 on Sw101
- Assign the last usable IP address to e0/0 on Sw102

2. Subnet 2001:db8::/52 to meet the subnet requirements and maximize the number of hosts
• Using the second subnet
- Assign an IPv6 GUA using a unique 64-Bit interface identifier on e0/0 on Sw101
- Assign an IPv6 GUA using a unique 64-Bit interface identifier on e0/0 on Sw102

Show Suggested Answer

Suggested Answer:

by picho707 at Jan. 9, 2024, 8:22 p.m.

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picho707

Highly Voted 12 months ago

SB: 10.20.0.0/16 Network ID: 10.20.16.0 Broadcast ID: 10.20.31.255 Subnet: 255.255.240.0 Usable IPs in the subnet = 10.20.16.1 - 10.20.31.254 SW101(config)#ipv6 unicast-routing SW101(config)#interface gigabitEthernet 0/0 SW101(config-if)#no switchport SW101(config-if)#ip address 10.20.16.1 255.255.240.0 SW101(config-if)#ipv6 address 2001:DB8:0:100::1/64 SW101(config-if)#no shutdown SW102(config)#ipv6 unicast-routing SW102(config)#interface gigabitEthernet 0/0 SW102(config-if)#no switchport SW102(config-if)#ip address 10.20.31.254 255.255.240.0 SW102(config-if)#ipv6 address 2001:DB8:0:100::2/64 SW102(config-if)#no shutdown So, the new prefix length will be 52 + 4 = 56. Therefore, the subnets will have a prefix of /56. The subnets will be: 1. 2001:DB8:0:0000::/56 2. 2001:DB8:0:0100::/56 3. 2001:DB8:0:0200::/56 and so on.

upvoted 8 times

nothanksimgucci

10 months, 3 weeks ago

"Assign an IPv6 GUA using a unique 64-Bit interface identifier" implies not to use ::1 and ::2 but rather ::/64 EUI-64

upvoted 5 times

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exiledwl

Most Recent 3 months, 1 week ago

A lot of wrong answers here with ipv6 portion allow me to help clarify 1) we are using the eui-64 command to auto assign 2) in order to use the eui 64 command, you HAVE to use a /64 prefix 3) we are using the second subnet for these commands in other words: 2001:0db8:0000:1000 /64, (remember each hexadecimal digit is made up of 4 binary digits) so the commands on each router for ipv6 are #ipv6 unicast-routing #ipv6 address 2001:db8:0:1000::/64 eui-64

upvoted 1 times

exiledwl

3 months, 1 week ago

Hold on I was wrong! I can't delete or edit my comment but after further research: I have also made a mistake in my ipv6 calculation and forgot to accomodate for 16 subnets in which case our 2001:0db8:0000:0000::/52 will become a /56 subnet and the second subnet will be 2001:0db8:0:0100 putting this into the cli we will get #ipv6 address 2001:db8:0:0100::/56 eui-64 and yes we CAN use a prefix that isn't /64 for the eui command to work, chatgpt lied to me

upvoted 2 times

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tumajay

7 months, 3 weeks ago

for ipv4 10.20.0.0/16 16 subnets = 2^4 =10.20.0.0/20 mask= 255.255.240.0 1st subnet =10.20.0.1 to 10.20.15.254 2nd subnet = 10.20.16.1 to 10.20.31.254 Sw101 en conf t int e0/0 ip address 10.20.16.1 255.255.240.0 no shut do wr sw102 en conf t int e0/0 ip address 10.20.31.254 255.255.240.0 no shut do wr for ipv6 2001:db8::/52 16 subnets = 2^4 =2001:db8::/56 =2001:0db8:0:0000 xxxx 0000 0000::/56 1=2001:0db8:0:(0000) (xxx0) (0000) (0000):/56= 2001:0db8:0:0000/56 2=2001:0db8:0:(0000) (xxx1) (0000) (0000):/56= 2001:0db8:0:0100/56 task 2 sw101 ipv6 unicast routing int e0/0 no switchport ipv6 address 2001:db8:0:0100::/56 eui-64 no shut end wr sw102 ipv6 unicast routing int e0/0 no switchport ipv6 address 2001:db8:0:0100::/56 eui-64 no shut end wr

upvoted 2 times

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dorian81

9 months ago

# TASK 1 Sw101(config)# int e0/0 Sw102(config-if)# no switchport Sw101(config-if)# ip address 10.20.16.1 255.255.240.0 Sw102(config)# int e0/0 Sw102(config-if)# no switchport Sw102(config-if)# ip address 10.20.31.254 255.255.240.0 # TASK 2 Sw101(config)#int e0/0 Sw101(config-if)# ipv6 address 2001:db8:0:100::/64 eui-64 Sw102(config)#int e0/0 Sw102(config-if)# ipv6 address 2001:db8:0:100::/64 eui-64 ALL# copy running-config startup-config (note : ipv6 unicast-routing is useless here because ipv6 packet forwarding or RA sending is not required. In addition, when ipv6 is configured on an interface, ipv6 is automatically enabled on that interface, so enabling ipv6 is not necessary.)

upvoted 2 times

dorian81

9 months ago

*Correction : In addition, when an ipv6 address is configured on an interface, ipv6 is automatically enabled on that interface, so ipv6 enable command is not necessary.

upvoted 2 times

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d5c03de

9 months, 3 weeks ago

[ ] = Bianary representation 2001:0DB8:0000:[0000 xxxx 0000 0000]::/56 where x -> subnet bits 2001:0DB8:0000:[0000 0000 0000 0000]::/56 second subnet = 2001:0DB8:0000:[0000 0001 0000 0000]::/56 Back to hex = 2001:0DB8:0000:0100::/56 = 2001:DB8:0:100::/56 SW101(config)#ip routing SW101(config)#ipv6 unicast-routing SW101(config)#interface gigabitEthernet 0/0 SW101(config-if)#no switchport SW101(config-if)#ip address 10.20.16.1 255.255.240.0 SW101(config-if)#ipv6 address 2001:DB8:0:100::/64 eui-64 SW101(config-if)#no shutdown SW101(config)#ip routing SW102(config)#ipv6 unicast-routing SW102(config)#interface gigabitEthernet 0/0 SW102(config-if)#no switchport SW102(config-if)#ip address 10.20.31.254 255.255.240.0 SW102(config-if)#ipv6 address 2001:DB8:0:100::/64 eui-64 SW102(config-if)#no shutdown write memory

upvoted 3 times

d5c03de

9 months, 3 weeks ago

"2001:0DB8:0000:[0000 0001 0000 0000]::/56 second subnet =" correction on line 3.

upvoted 1 times

d5c03de

9 months, 3 weeks ago

Disregard line 3 is correct. Moderator, please delete this and my previous response.

upvoted 1 times

Nmk173

8 months ago

ipv6 address 2001:DB8:0:100::/56 eui-64 i think prefix must be 56

upvoted 1 times

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ladarius01

10 months, 1 week ago

10.20.0.0/16 needs to be subnetted into 16 networks. 2^n = 16, n = 4. /16 + 4 = /20 Need to assign IPs from second subnet. First subnet is: Network: 10.20.0.20 /20 Broadcast: 10.20.0000|1111.11111111 = 10.20.15.255 /20 Second subnet = first subnet broadcast + 1 Network: 10.20.16.0 /20 Broadcast: 10.20.0001|1111.11111111 = 10.20.31.255 /20 First Usable: 10.20.16.1 /20 Last Usable: 10.20.31.254 /20 IPv6 Addresses will use EUI-64 to generate unique 64-Bit interface identifier Sw101# en Sw101# conf t Sw101# in e0/0 Sw101# no switchport Sw101# ip address 10.20.16.1 255.255.240.0 Sw101#ipv6 address 2001:db8::/52 eui-64 Sw101#exit Sw101# ipv6 unicast-routing Sw102# en Sw102# conf t Sw102# no switchport Sw102# ip address 10.20.16.31.254 255.255.240.0 Sw102# ipv6 address 2001:db8::/52 eui-64 Sw102# exit Sw102# ipv6 unicast-routing

upvoted 1 times

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Exam 200-301 All Questions

View all questions & answers for the 200-301 exam

Exam 200-301 topic 1 question 1295 discussion

Comments

picho707

nothanksimgucci

exiledwl

exiledwl

tumajay

dorian81

dorian81

d5c03de

d5c03de

d5c03de

Nmk173

ladarius01

SY0-701