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2021 Aug 4A0-100 test
Q1. Which network was created to replace ARPANET?
A. INWG
B. ALOHANET
C. IETF
D. NSFNET
Answer: D
Q2. Which of the following is NOT a field in a TCP header?
A. Source port.
B. MTU.
C. Sequence number.
D. Acknowledgement number.
E. Window size.
Answer: B
Q3. Which answer reflects the correct message sequence used when a source attempts to ping a destination for which it has no Address Resolution Protocol (ARP) cache entry?
A. ICMP echo request, ARP request, ARP reply, ICMP echo reply
B. ARP request, ARP reply, ICMP echo request, ICMP echo reply
C. ICMP echo request, ICMP echo reply, ARP request, ARP reply
D. ICMP echo request. ARP reply, ARP request, ICMP echo reply
Answer: B
Q4. What are the tasks of a Routing Table Manager (RTM)? (Choose 2)
A. To select the best route from among multiple routing protocols.
B. To select the best route using the metric as criteria.
C. To send its best route to all its directly connected neighbors.
D. To install its best route in the routing table.
Answer: A,D
Q5. What is the basic unit of framing in SDH and the bit rate for transmission?
A. STM-1 with a bit rate of 1.544 Mbit/s.
B. STM-1 with a bit rate of 2.048 Mbit/s.
C. STM-1 with a bit rate of 51.84 Mbit/s.
D. STM-1 with a bit rate of 155.52 Mbit/s.
Answer: D
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Q6. Which of the following are NOT examples of a VPN service offered on the Alcatel-Lucent 7750 SR? Choose two.
A. VPWS Virtual Private Wire Service
B. VPLS Virtual Private LAN Service.
C. VPRN Virtual Private Routed Networks.
D. MLPPP Multi-link Point-to-Point protocol
E. VPDFS Virtual Private Dark Fiber Service.
Answer: D,E
Q7. Kahn solved the problem of interconnecting different networks using different protocols by pioneering a new protocol called TCP that was capable of:
A. Secure transmission of information.
B. Enforcing a constant packet size to avoid discards.
C. Allowing remote logins.
D. Providing host to host connectivity with global addressing.
Answer: D
Q8. In the diagram, R7 receives a new LSA from R3 and installs it in its link state database. 10 ms. later it receives another copy of the LSA with the same sequence number from R8. What does R7 do with the LSA received from R8?
A. R7 silently discards the LSA received from R8.
B. R7 installs the LSA received from R8 in its link state database andfloods a copy to its neighbors.
C. R7 discards the LSA received from R8 and sends an ACK to R8.
D. R7 installs the LSA received from R8 in its link state database, sends an ACK to R8 andfloods a copy to its neighbors.
Answer: C
Q9. Which of the following are correct statements about MPLS labels? (Choose 3)
A. A sequence of label actions from one LER to another LER represents a logical tunnel known as an LSP.
B. MPLS labels must be dynamically signaled.
C. Labels are globally significant to the MPLS network.
D. MPLS labels may be dynamically signaled or statically assigned by the service provider.
E. Labels are locally significant to the MPLS router.
Answer: A,D,E
Q10. Which of the following is a feature of a VLAN?
A. A VLAN allows multiple Ethernet switches to be connected in a single broadcast domain.
B. A VLAN allows multiple Ethernet switches to be connected in a single collision domain.
C. A VLAN can separate ports on the same switch into different broadcast domains.
D. A VLAN can separate ports on the same switch into different collision domains.
Answer: C