Virtual 4A0-100 Study Guides 2021

NEW QUESTION 1
Which of the following statements are TRUE regarding SONET/SDH? (Choose 2)

• A. They are deployed over point-to-point physical topologies to allow sub-50ms convergenc
• B. An ADM (Add Drop Multiplexer) is used to connect various sites to the infrastructur
• C. IP datagrams are encapsulated in a PPP frame for transmission over an SDH network,
• D. IP datagrams are encapsulated in an Ethernet frame for transmission over a SONET networ

Answer: BC

NEW QUESTION 2
A Class C network is defined by a:

• A. 32-bit network prefi
• B. 24-bit network prefi
• C. 16-bit networ
• D. 8-bit networ

Answer: B

NEW QUESTION 3
Which of the following is characteristic of a static route?

• A. Responds in real time to network failure
• B. Can only be used for routing within an autonomous syste
• C. Uses a hop-count metric to determine the best route to a networ
• D. Explicitly defines the next hop based on operator inpu

Answer: D

NEW QUESTION 4
At what stage in the packet forwarding process,is the IP packet header examined?

• A. When the router first receives a frame from a LA
• B. After the forwarding table is checke
• C. After the IP datagram is extracted from the L2 fram
• D. Immediately before the IP packet is encapsulated for transmissio

Answer: C

NEW QUESTION 5
In the diagram, what type of BGP session is established between the routers of AS 65001 and AS 2002?

• A. IGP
• B. IBGP
• C. EBGP
• D. EGP
• E. BGPcannotbe run between routers in different AS

Answer: C

NEW QUESTION 6
Which of the following describes the Alcatel-Lucent 7750 SR Input/Output Module (IOM)?

• A. Small optical module available in a variety of format
• B. Contains a CPU for managing the forwarding hardware in each flexible fast pat
• C. Converts traffic from an external standard format to an internal forma
• D. Contains the CPU that runs the routing protocol software as well as the switch fabri

Answer: B

NEW QUESTION 7
What is the purpose of the Data Link Layer in the OSI model?

• A. The Data Link Layer is responsible for encapsulating the packet into a frame for transmission on the transmission medi
• B. The Data Link Layer is responsible for encapsulating the packet into an IP header and routing the packe
• C. The Data Link Layer is responsible for formatting the packet for applications such as JPEG forma
• D. The Data Link Layer is responsible for timing of the signals on the transmission media

Answer: A

NEW QUESTION 8
What must occur before two hosts can exchange data using TCP?

• A. Nothin
• B. The two hosts can send data to each other at any tim
• C. The two hosts must negotiate a path MTU to be used for the data exchang
• D. The two hosts must perform a 3-way handshake before transmitting dat
• E. The two hosts must exchange encryption keys before transmitting dat

Answer: C

NEW QUESTION 9
Which field in the IP routing table contains the name or address of the neighbour that advertised the prefix to the router?

• A. Preferenc
• B. Metri
• C. Dest prefi
• D. Next ho

Answer: D

NEW QUESTION 10
Which of the following is a feature of Layer 3?

• A. Provides an universal addressing scheme
• B. Ensures data is delivered across the Layer 2 networ
• C. Provides reliable data transfer
• D. Provides a physical interface to the networ

Answer: A

NEW QUESTION 11
What metric does a link state protocol use to choose the best path to a destination network?

• A. Link bandwidt
• B. Round trip tim
• C. Hop coun
• D. Route preferenc

Answer: A

NEW QUESTION 12
What operation is performed by an LSR when it receives an MPLS labeled packet?

• A. The LSR refers to its routing table and forwards the packet to the next LSR or LER without altering the MPLS labe
• B. The LSR refers to its MPLS label table, swaps the label and forwards the packet to the next LSR or LE
• C. The LSR refers to its MPLS label table forwards the packet to the next LSR or LER without altering the MPLS labe
• D. The LSR refers to its MPLS label table, pops the label and forwards the packet to the next IP route

Answer: B

NEW QUESTION 13
How does the Transport Layer identify which application is to receive the data?

• A. Using the IP address of the packe
• B. Using the MAC address of the fram
• C. Using port number
• D. Using Connection Identifier Numbers (CIN).

Answer: C

NEW QUESTION 14
A 24 port Ethernet switch is configured with VLAN 100 on ports 1 - 8, VLAN 200 on ports 9
-
16 and VLAN 300 on ports 17 - 24. Which of the following describes the behavior of the switch when a broadcast frame is received on port 1?

• A. The switch will discard the broadcast frame because there is no specific destination addres
• B. The switch will flood the broadcast frame on all ports on which the switch has seen frames from attached devices
• C. The switch will flood the broadcast frame on ports 2 to 8.
• D. The switch will flood the broadcast frame on all 24 port

Answer: C

NEW QUESTION 15
When a device in an IP network receives an echo request message that is destined for itself, it then:

• A. Estimates the round trip-tim
• B. Generates an echo repl
• C. Calculates the data loss statistic
• D. Verifies the data field of the messag

Answer: B

NEW QUESTION 16
Which of the following best describes the operation of the Media Dependent Adapter (MDA)?

• A. The MDA contains the flexible fast path complex used for forwarding dat
• B. Excess data is discarded by the MDA and the remaining data forwarded for QoS processin
• C. The MDA buffers data and applies Quality of Service (QoS) to classify and treat the data appropriatel
• D. The MDA converts data from its incoming physical format into an internal format and provides some minimal bufferin

Answer: D

NEW QUESTION 17
Which of the following is TRUE regarding Ethernet half-duplex transmission?

• A. Half-duplex transmission is less efficient because the frame MTU is smalle
• B. An end-station connected to a hub will always be half-duple
• C. Ethernet switches only support half-duplex transmissio
• D. All of the abov

Answer: B

NEW QUESTION 18
Public IP addresses are globally coordinated by which organization?

• A. Network Solutions INC
• B. IANA
• C. IETF
• D. ITU-T
• E. IEEE

Answer: B