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Q11. Which Ethernet frame field does the receiver use to verify the integrity of the received bits?
A. Destination address
B. Frame check sequence
C. Preamble
D. Length field
Answer: B
Q12. Whichof the following is the best description of well known ports?
A. Well known ports apply to routers only and are used for communication and control traffic. Well known port numbers are assigned by IANA and can have any value.
B. Well known ports are used by TCP and UDP. Well known port numbers range from 1024 to 65535 and are assigned by IANA.
C. Well known port numbers are used by both TCP and UDP. Well known port numbers range from 1 to 1023 and are assigned by IANA.
D. Well known ports numbers are used by TCP only. Well known port numbers are assigned by IANA and can have any value.
Answer: C
Q13. In an MPLS network, which device is responsible for taking an unlabeled packet and encapsulating it with an MPLS label?
A. Ingress Label Edge Router
B. Egress Label Edge Router
C. Label Switching Router
D. Next Hop Router
Answer: A
Q14. Which device is responsible for removing the MPLS label before the packet reaches the CE device?
A. The CE device removes the MPLS label.
B. The last LSR on the LSP removes the MPLS label.
C. MPLS labels are not removed until they reach the final destination.
D. The egress LER removes the MPLS label.
Answer: D
Q15. Network address: 200.12.30.0
Network mask: 255.255.255.0
Use the information above. You need to create 12 subnetworks supporting 10 host addresses each.
Which extended prefix will meet this requirement?
A. /12
B. /24
C. /26
D. /28
E. /30
Answer: D
Up to date 4A0-100 book:
Q16. Choose two true statements that characterize Link State Routing
A. Routers send a copy of their routing table to their neighbors periodically.
B. Routers flood link information throughout the entire area.
C. Network converges quickly (within several seconds) after a topology change.
D. Routers do not have precise knowledge of the entire network topology.
Answer: B,C
Q17. What is the purpose of the broadcast address?
A. Provides an address that refers to all the devices in a given network.
B. Provides an address to refer to a specific group of devices in a given network.
C. Provides an address to refer to a group of devices having the same IP addresses in different Layer 2 networks.
D. Provides an address to refer to a single device on a given network.
Answer: A
Q18. What is NOT a function ofthe IOM?
A. It forwards the data to the switch fabric.
B. It discards excess data packets.
C. It converts the incoming data to an internal format.
D. It performs Quality of Service operations and buffers incoming data.
Answer: C
Q19. The sequence numbers are used by TCP to ensure that the data receive is provided to the application in the correct order.
A. TRUE
B. FALSE
Answer: A
Q20. Using Q-in-Q Virtual Local Area Network (VLAN) stacking, how does a carrier differentiate onecustomers traffic from that of another?
A. The provider edge (PE) switch adds an additional field called a PE tag to the customers Layer 2 data.
B. The PE switch replaces the customers VLAN tag with a carrier-assigned tag.
C. The PE switch adds a second VLAN tag to identify the customers traffic on the carriers network.
D. The PE switch assigns a customer-specific priority label to the customers traffic.
Answer: C