200-125 Exam
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Q31. - (Topic 8)
Which MTU size can cause a baby giant error?
A. 1500
B. 9216
C. 1600
D. 1518
Answer: C
Explanation: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/29805-175.html
Q32. - (Topic 6)
Refer to the exhibit.
The following commands are executed on interface fa0/1 of 2950Switch. 2950Switch(config-if)# switchport port-security
2950Switch(config-if)# switchport port-security mac-address sticky 2950Switch(config-if)# switchport port-security maximum 1
The Ethernet frame that is shown arrives on interface fa0/1. What two functions will occur when this frame is received by 2950Switch? (Choose two.)
A. The MAC address table will now have an additional entry of fa0/1 FFFF.FFFF.FFFF.
B. Only host A will be allowed to transmit frames on fa0/1.
C. This frame will be discarded when it is received by 2950Switch.
D. All frames arriving on 2950Switch with a destination of 0000.00aa.aaaa will be forwarded out fa0/1.
E. Hosts B and C may forward frames out fa0/1 but frames arriving from other switches will not be forwarded out fa0/1.
F. Only frames from source 0000.00bb.bbbb, the first learned MAC address of 2950Switch, will be forwarded out fa0/1.
Answer: B,D
Explanation:
The configuration shown here is an example of port security, specifically port security using sticky addresses. You can use port security with dynamically learned and static MAC addresses to restrict a port's ingress traffic by limiting the MAC addresses that are allowed to send traffic into the port. When you assign secure MAC addresses to a secure port, the port does not forward ingress traffic that has source addresses outside the group of defined addresses. If you limit the number of secure MAC addresses to one and assign a single secure MAC address, the device attached to that port has the full bandwidth of the port.
Port security with sticky MAC addresses provides many of the same benefits as port security with static MAC addresses, but sticky MAC addresses can be learned dynamically. Port security with sticky MAC addresses retains dynamically learned MAC addresses during a link-down condition.
Q33. - (Topic 3)
Refer to the exhibit.
What commands must be configured on the 2950 switch and the router to allow communication between host 1 and host 2? (Choose two.)
A. Router(config)# interface fastethernet 0/0 Router(config-if)# ip address 192.168.1.1 255.255.255.0 Router(config-if)# no shut down
B. Router(config)# interface fastethernet 0/0 Router(config-if)# no shut down Router(config)# interface fastethernet 0/0.1 Router(config-subif)# encapsulation dot1q 10
Router(config-subif)# ip address 192.168.10.1 255.255.255.0 Router(config)# interface fastethernet 0/0.2
Router(config-subif)# encapsulation dot1q 20
Router(config-subif)# ip address 192.168.20.1 255.255.255.0
C. Router(config)# router eigrp 100 Router(config-router)# network 192.168.10.0
Router(config-router)# network 192.168.20.0
D. Switch1(config)# vlan database Switch1(config-vlan)# vtp domain XYZ
Switch1(config-vlan)# vtp server
E. Switch1(config)# interface fastethernet 0/1 Switch1(config-if)# switchport mode trunk
F. Switch1(config)# interface vlan 1 Switch1(config-if)# ip default-gateway 192.168.1.1
Answer: B,E
Explanation:
The router will need to use subinterfaces, where each subinterface is assigned a VLAN and IP address for each VLAN. On the switch, the connection to the router need to be configured as a trunk using the switchport mode trunk command and it will need a default gateway for VLAN 1.
Q34. - (Topic 5)
Refer to the exhibit.
Which address range efficiently summarizes the routing table of the addresses for router Main?
A. 172.16.0.0./21
B. 172.16.0.0./20
C. 172.16.0.0./16
D. 172.16.0.0/18
Answer: B
Explanation:
The 172.16.0.0./20 network is the best option as it includes all networks from 172.16.0.0 –
172.16.16.0 and does it more efficiently than the /16 and /18 subnets. The /21 subnet will not include all the other subnets in this one single summarized address.
Q35. - (Topic 6)
Which statement about access lists that are applied to an interface is true?
A. You can place as many access lists as you want on any interface.
B. You can apply only one access list on any interface.
C. You can configure one access list, per direction, per Layer 3 protocol.
D. You can apply multiple access lists with the same protocol or in different directions.
Answer: C
Explanation:
We can have only 1 access list per protocol, per direction and per interface. It means:
+ We cannot have 2 inbound access lists on an interface
+ We can have 1 inbound and 1 outbound access list on an interface
Q36. - (Topic 8)
On which type of device is every port in the same collision domain?
A. a router
B. a Layer 2 switch
C. a hub
Answer: C
Explanation: Collision domainA collision domain is, as the name implies, a part of a
network where packet collisions can occur. A collision occurs when two devices send a packet at the same time on the shared network segment. The packets collide and both devices must send the packets again, which reduces network efficiency. Collisions are often in a hub environment, because each port on a hub is in the same collision domain. By contrast, each port on a bridge, a switch or a router is in a separate collision domain.
Q37. - (Topic 5)
What will happen if a private IP address is assigned to a public interface connected to an ISP?
A. Addresses in a private range will not be routed on the Internet backbone.
B. Only the ISP router will have the capability to access the public network.
C. The NAT process will be used to translate this address to a valid IP address.
D. A conflict of IP addresses happens, because other public routers can use the same range.
Answer: A
Explanation:
Private RFC 1918 IP addresses are meant to be used by organizations locally within their own network only, and cannot be used globally for Internet use.
Q38. - (Topic 3)
Which parameter or parameters are used to calculate OSPF cost in Cisco routers?
A. Bandwidth
B. Bandwidth and Delay
C. Bandwidth, Delay, and MTU
D. Bandwidth, MTU, Reliability, Delay, and Load
Answer: A
Explanation:
The well-known formula to calculate OSPF cost is Cost = 108 / Bandwidth
Q39. - (Topic 4)
What occurs on a Frame Relay network when the CIR is exceeded?
A. All TCP traffic is marked discard eligible.
B. All UDP traffic is marked discard eligible and a BECN is sent.
C. All TCP traffic is marked discard eligible and a BECN is sent.
D. All traffic exceeding the CIR is marked discard eligible.
Answer: D
Explanation:
Committed information rate (CIR): The minimum guaranteed data transfer rate agreed to by the Frame Relay switch. Frames that are sent in excess of the CIR are marked as discard eligible (DE) which means they can be dropped if the congestion occurs within the Frame Relay network.
Note: In the Frame Relay frame format, there is a bit called Discard eligible (DE) bit that is used to identify frames that are first to be dropped when the CIR is exceeded.
Q40. - (Topic 8)
How can you disable DTP on a switch port?
A. Configure the switch port as a trunk.
B. Add an interface on the switch to a channel group.
C. Change the operational mode to static access.
D. Change the administrative mode to access.
Answer: A