DHCP Sim
[am4show have=’p2;’]
Premium Member: You can try this sim with our simulator here.
[/am4show]
Refer to the topology below and answer the questions.
For your reference, the configurations of these three routers are posted below (unnecessary lines are omitted)
| R1#show running-config ! interface Loopback0 ip address 192.168.250.1 255.255.255.255 ! interface Ethernet0/0 description Link to ISP ip address 209.165.200.225 255.255.255.224 ip nat inside ip virtual-reassembly in ! interface Ethernet0/1 description Link to Server 1 ip address 172.16.200.1 255.255.255.0 ip nat outside ip virtual-reassembly in ! interface Ethernet0/2 description Link to R2 ip address 192.168.10.1 255.255.255.252 ip nat outside ip virtual-reassembly in ! router rip version 2 network 172.16.0.0 network 192.168.10.0 network 192.168.250.0 default-information originate no auto-summary ! ip nat inside source list LOCAL interface Ethernet0/0 overload ip route 0.0.0.0 0.0.0.0 209.165.200.226 ! ip access-list standard LOCAL permit 10.0.0.0 0.255.255.255 permit 172.16.0.0 0.0.255.255 permit 192.168.0.0 0.0.255.255 ! ntp server 209.165.200.226 ! end |
R2#show running-config ! ip dhcp excluded-address 192.168.20.1 ! ip dhcp pool DHCPASSIGN3 network 192.168.20.0 255.255.255.252 ! interface Loopback0 ip address 192.168.250.2 255.255.255.255 ! interface Ethernet0/0 description Link to R3 ip address 192.168.20.1 255.255.255.252 ! interface Ethernet0/2 description Link to R1 ip address 192.168.10.2 255.255.255.252 ip access-group SERVER1BLOCK in ! interface Ethernet0/3 description Link to LAN ip address 10.100.20.1 255.255.255.0 ! router rip version 2 network 10.0.0.0 network 192.168.10.0 network 192.168.20.0 network 192.168.250.0 ! ip access-list standard SERVER1BLOCK deny 172.16.200.0 0.0.0.255 permit any ! ntp server 192.168.100.1 ! end |
| R3#show running-config ! interface Loopback0 ip address 192.168.250.3 255.255.255.255 ! interface Ethernet0/0 description Link to LAN ip address 10.100.10.1 255.255.255.0 ! interface Ethernet0/1 description Link to R2 no ip address ! interface Ethernet0/2 description Link to Server2 ip address 10.100.11.1 255.255.255.0 ! router rip version 2 network 10.0.0.0 network 192.168.20.0 no auto-summary ! end |
| Note: You may see this sim with different errors like Nat Access-list misconfigured , DHCP pool mistyped. So please check the config of the devices carefully and grasp the concept behind to solve them. |
Question 1
Examine the DHCP configuration between R2 and R3, R2 is configured as the DHCP server and R3 as the client. What is the reason R3 is not receiving the IP address via DHCP?
A. On R3, DHCP is not enabled on the interface that is connected to R2.
B. On R3, the interface that is connected to R2 is in shutdown condition.
C. On R2, the interface that is connected to R3 is in shutdown condition.
D. On R2, the network statement in the DHCP pool configuration is incorrectly configured.
Answer: A
Explanation
First we should check which interface on R3 that is connected to R2 via the “show run” command.
From the description we learn interface E0/1 is connected to R2. Use the “show ip interface brief” command to verify the IP address of this interface.
Therefore we can conclude this interface does not have any IP address and there is no configuration on this interface (except the “description Link to R2” line).
If R3 wants to receive an IP address from R2 via DHCP, interface E0/1 should be configured with the command “ip address dhcp” so the answer “DHCP is not enabled on this interface” is correct.
Question 2
R1 router clock is synchronized with ISP router. R2 is supposed to receive NTP updates from R1. But you observe that R2 clock is not synchronized with R1. What is the reason R2 is not receiving NTP updates from R1?
A. R1 router Ethernet interface that is connected to R2 is placed in shutdown condition.
B. R2 router Ethernet interface that is connected to R1 is placed in shutdown condition.
C. The NTP server command not configured on R2 router.
D. The IP address that is used in the NTP configuration on R2 router is incorrect.
Answer: D
Explanation
First we should verify if the ports connected between R1 and R2 is in “up/up” state with the “show ip interface brief” command on R1 & R2.
Note: We learn R1 & R2 connect to each other via E0/2 interface because the IP addresses of these interfaces belong to 192.168.10.0/30 subnet. Both of them are “up/up” so the link connecting between R1 & R2 is good.
Next we need to verify the ntp configuration on R2 with the “show running-config” command.
So there is only one command related to NTP configuration on R2 so we need to check if the IP address of 192.168.100.1 is correct or not. But from the “show ip interface brief” command on R1 we don’t see this IP -> This IP address is not correct. It should be 192.168.10.1 (IP address of interface E0/2 of R1), not 192.168.100.1.
Question 3
Why applications that are installed on PC’s in R2 LAN network 10.100.20.0/24 are unable to communicate with Server1?
A. A standard ACL statement that is configured on R1 is blocking the traffic sourced from R2 LAN network.
B. A standard ACL statement that is configured on R1 is blocking the traffic sourced from Server1 network.
C. A standard ACL statement that is configured on R2 is blocking the traffic sourced from Server1 network.
D. A standard ACL statement that is configured on R2 is blocking the traffic sourced from R2 LAN network.
Answer: C
Explanation
We should check if we can ping from R1 to Server 1 or not:
The ping worked well so maybe R1 is good so we should check R2 first. We notice on R2 there is an access-list:
This access-list is applied to E0/2 interface with inbound direction. The purpose of this access-list is to block traffic with source IP address of 172.16.200.0/24 so it will block all traffic sent from Server 1 to us.
Question 4
Users complain that they are unable to reach internet sites. You are troubleshooting internet connectivity problem at main office. Which statement correctly identifies the problem on Router R1?
A. NAT configurations on the interfaces are incorrectly configured.
B. NAT translation statement incorrectly configured.
C. Interesting traffic for NAT ACL is incorrectly configured.
D. Only static NAT translation configured from the server, missing Dynamic NAT or Dynamic NAT overloading for internal networks.
Answer: A
Explanation
If all users cannot access internet then R1 is most likely to cause the problem so we should check it first. From the “show running-config” command we will see:
We notice that interface E0/0 (connected to ISP) has been configured as “nat inside” while interfaces E0/1 & E0/2 (connected to our company) have been configured as “nat outside”. This is not correct because “nat inside” should be configured with interfaces connected to our company while “nat outside” should be configured with interfaces connected to the internet. Therefore we can conclude the NAT configuration on these interfaces is not correct.
| Note (again): You may see this sim with different errors like Nat Access-list misconfigured , DHCP pool mistyped. So please check the config of the devices carefully and grasp the concept behind to solve them. |
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1. which two reasons might you choose chassis aggregation instead of stacking switches ? choose two
A. to allow hot swapping modules
B. to avoid relying solely on ethernet interfaces
C. to increase the number of devices in use
D. to avoid the use of a centralized configuration manager
E. to increase the maximum port count
Some where the answer is BC and somewhere CD
2. When a router is unable to find a known route in the routing table, how does it handle the packet?
A. It discards the packet
B. It sends the packet over the route with the best metric
C. It sends the packet to the next hop address
D. It sends the packet to the gateway of last resort
Some where the answer is A and somewhere D
3. Which two steps must you perform on each device that is configured for ipv4 routing before you implement OSPFv3? (chooose two)
A. configure an autonomous system number
B. configure a loopback interface
C. configure a router ID
D. enable IPv6 on an interface
E. enable IPv6 unicast routing
Some where the answer is CE and somewhere DE
4. Which two IP SLA operations can you use to measure the end-to-end response timefor all IP traffic between a Cisco router and an end device?
A. ICMP path Jitter
B. UDP Jitter
C. ICMP path echo
D. ICMP echo
E. TCP connect
F. UDP echo
This question has many answers. Which is the correct one?
5. Router R1 has a static router that is configured to a destination network. A directly connected inference is configured with an ip address in the same destination network . which statement about R1 is true ?
A. R1 sends a withdrawal notification to the neighboring router
B. R1 prefers the directly connected interface.
C. R1 Refuses to Advertise the dynamic router to other neighbors
D. R1 prefers the static route
Some where the answer is B and somewhere D
6. Which two options are fields in an ethernet frame ? choose two
A. destination ip address
B. source ip address
C. type
D. frame check sequence
E. header
Some where the answer is AB and somewhere CD
7. Which two statements about IPv4 multicast traffic are true? (Choose two.)
A. It burdens the source host without affecting remote hosts.
B. It uses a minimum amount of network bandwidth.
C. It is bandwidthintensive.
D. It simultaneously delivers multiple streams of data.
E. It is the most efficient way to deliver data to multiple receivers
Some where the answer is BE and somewhere DE
8. Which two statements about EUI-64 addressing are true? (Choose two)
A. A 64-bit interface identifier is derived from the interface MAC address
B. A 96-bit interface identifier is derived from the interface MAC address.
C. A locally administered address has the universal/local bit set to 0.
D. The address includes the hex digits FFFE after the first 24 bits of the interface MAC address
E. The address includes the hex digits FFFE after the last 24 bits of the interface MAC address
Some where the answer is AD and somewhere CD
9. Which two functions can be performed by a local DNS server? (Choose two)
A. transferring spirt horizon traffic between zones
B. Forwarding name resolution requests to an external DNS server
C. assigning IP addresses to local clients
D. resolving names locally
E. copying updated IOS images to Cisco switches
Some where the answer is BC and somewhere BD
10. What are two requirements for an HSRP group? (Choose two.)
A. exactly one active router
B. one or more standby routers
C. one or more backup virtual routers
D. exactly one standby active router
E. exactly one backup virtual router
Some where the answer is AB and somewhere AD
11. you are configuring an ip sla icmp echo operation to troubleshoot a network connectivity issue. When do you enter an ip address to test the ip SLA?
A. When you verfy the ip sla operation
B. When you specify the test frequency
C. When you enable the icmp echo operation
D. When you define the icmp echo operatio
Some where the answer is A and somewhere C
12. you have configured a router with an ospf router id , but its ip address still reflects the physical interface. Which action can you take ……. Problem In the least disruptive way ?
A. Specify a loopback address
B. Reload the ospf process
C. Reboot the router
D. Save the router configuration
Some where the answer is A and somewhere B
13. Which command is configure on a switch to enable neighbor discovery in a multivendor environment?
A. IIdp run
B. IIdp transmit
C. IIdp receive
D. cdp run
What is the answer ? A or D
14. Which two advantages do dynamic touting protocols provide over static routing?
A. Dynamic routing requires fewer resources than static routing.
B. Only dynamic routing is supported on all topologies that require multiple routers.
C. Dynamic routing protocols ate easier to manage on very large networks.
D. Dynamic routing protocols automatically adapt to reroute traffic it possible.
E. Dynamic routing is more secure than static routing.
Some where the answer is CD and somewhere BD
15. Which two functions can be performed by a local DNS server?
A. transferring spirt horizon traffic between zones
B. Forwarding name resolution requests to an external DNS server
C. assigning IP addresses to local clients
D. resolving names locally
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16. Which two tasks does a router perform when it receives a packet that is being forwarded from one network to another?
A. It removes the Layer 2 frame header and trailer.
B. It encapsulates the Layer 2 packet.
C. It removes the Layer 3 frame header and trailer.
D. It examines the routing table tor the best path to the destination IP address of the packet.
E. It examines the MAC address table for the forwarding interface
Some where the answer is AD and somewhere DE
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