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CCNA Multiple Choice Practice Questions

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  1. Which of the following observations related to internet traffic growth is NOT true?
    1. Traffic growth rate for the next five years is expected to be approximately ~32% CAGR.
    2. Traffic device mix is becoming increasingly portable and mobile
    3. Traffic growth is in a large part due to video distribution across the internet
    4. The majority of traffic volume is due to Voice over IP (VoIP)
  1. Which of the following is the most commonly used layer 2 protocol used in the LAN?
    1. Ethernet
    2. Token Ring
    3. Frame Relay
    4. FDDI
  1. What is the standard organization that has traditional defines Ethernet 802.3 protocols?
    1. FCC
    2. IETF
    3. ITU-T
    4. IEEE
  1. A WAN is generally viewed by the industry to be composed of the following network partitions
    1. Access, Metro, Core
    2. LAN, MAN, WAN
    3. Access, Metro, subnet
    4. LAN, Access, Core
  1. Which of the following is not true of protocols?
    1. A protocol is a mutually agreed upon set of conventions to allow successful communication to exist between two entities.
    2. A computer protocol is usually defined to achieve a service (a task or a small set of tasks)
    3. Protocols are composed of three elements: BAUD, bandwidth, and bit rate
    4. Protocols define what is communicated, how it is communicated, and when it is communicated and defines some mutually acceptable conventions.
  1. Which of the following is not true for a connection oriented network?
    1. packets in the message may travel along the different routes during the connection
    2. the PSTN is an example of a connection oriented network
    3. service is generally reliable (ie. Packets are delivered in sequence order )
    4. provides for an establishment, maintenance, and termination connection phase
  1. In a layered network model, layer N provides services to layer ______
    1. N -1 layer
    2. N+1 layer
    3. Peer layer
    4. Server layer
  1. The functional layers (by name) in the OSI stack from layer 1 to layer 7, in order, are:
    1. Physical, data link, network, transport, presentation, session, application
    2. Physical, data link, transport, network, session, presentation, application
    3. Physical, data link, network, transport, session, presentation, application
    4. Physical, data link, transport, network, presentation, session, application
  1. The principle advantage of a broadcast network compared to a point to point switched network is
    1. does not need to share link bandwidth across all users within the network
    2. is able to operate links at full duplex
    3. has a lower network equipment cost since network switches are not required
    4. requires a MAC protocol
  1. The examples of addresses used in layers 2, 3 and 4 are
    1. MAC address, port numbers, IP addresses, respectively
    2. port numbers, MAC address, IP addresses, respectively
    3. MAC address, IP addresses, port numbers, respectively
    4. None of the above
  1. A data link data unit, IP protocol data unit, TCP protocol data unit, and application data unit are called a __________, _________, _________, _________, respectively:
    1. Segment, frame, packet, frame
    2. Frame, segment, packet, message
    3. Frame, packet, segment, message
    4. Packet, frame, message, segment
  1. Which of following best explains the N2 problem exhibited by Mesh topology networks
    1. The number of switching devices grows proportional to N2, where N=# of links
    2. The number of links grows proportional to N2, where N=# of connected devices
    3. The number of connected devices grows proportional to N2, where N=# of links
    4. The number of collisions grows proportional to N2, where N=# of connected devices
  1. If the bandwidth of a signal is 56KHz and the lowest frequency of that signal is 60KHz, what is the highest frequency?
    1. 4KHz
    2. 66KHz
    3. 116KHz
    4. Cannot be computed with the information given
  1. Which of the following is not true of attenuation as a transmission penalty?
    1. Attenuation is the reduction of signal strength
    2. Attenuation increases as the medium distance increases
    3. Attenuation increases as the signal frequency (or bit rate) increases
    4. Attenuation increases as the jitter increases
  1. Which of the following is not a source of delay?
    1. Queuing delay
    2. Propagation delay
    3. Transmission delay
    4. Attenuation delay
  1. Suppose channel noise in a transmission channel corrupts 100 bits in a one second interval for a 100Mbps signal. The signal Bit Error Rate is:
    1. 100 x 10-8
    2. 100 x 108
    3. 1/100 x 10-8
    4. Cannot be computed with the information given
  1. Which of the following is an advantage that fiber has compared to copper media?
    1. fiber requires splicing
    2. fiber can tolerate a smaller bend radius
    3. fiber is less expensive (on a per unit length)
    4. fiber is immune electromagnetic interference
  1. In a fiber optic line, the outside layer is called the _______ and the center is called the ________, and the light travels in the _______
    1. core, cladding, core
    2. cladding, core, cladding
    3. core, cladding, cladding
    4. cladding, core, core
  1. The principle purpose of Collision Detect in CSMA/CD protocol is to
    1. test the media to determine if it is being used prior to data transmission to reduce the probability of an initial collision
    2. reduce subsequent collisions
    3. remove switching loops
    4. reduce the time it takes to detect that a collision has occurred
  1. Line of sight microwave signals are limited in distance (~30miles) between the transmitter and receiver along a terrestrial path (terrestrial implies propagating near the earth) because
    1. transmit power is not sufficient to transmit the signal beyond ~30miles
    2. Limited channel bandwidth due to the high microwave frequency
    3. The curvature of the earth
    4. noise introduced in the transmission path
  1. Which of the following correctly lists physical channel media in decreasing order of channel bandwidth (that is, from highest channel bandwidth to lowest channel bandwidth)?
    1. Single mode fiber, multi-mode fiber, coax, twisted pair
    2. multi mode fiber, single-mode fiber, coax, twisted pair
    3. Single mode fiber, coax, multi-mode fiber, twisted pair
    4. Single mode fiber, multi-mode fiber, twisted pair, coax
  1. Which of the following will cause an increase to the network line utilization, U?
    1. decrease frame length size
    2. increase the Round Trip Time (RTT)
    3. increase the maximum window size (Wmax) used for flow control
    4. increase the line data rate
  1. The Shannon Capacity Theorem formula determines the
    1. maximum line utilization, U, of a network
    2. maximum latency (in secs) of a transmission channel
    3. bit error rate of transmission line
    4. maximum theoretical data rate that can be supported by a channel with noise, limited channel bandwidth, and attenuation impairments
  1. Which of the following is the primary purpose of block coding performed within the Ethernet Physical layer
    1. improves collision resistance
    2. reduces latency and jitter
    3. to ease clock recovery, remove DC bias, and provide control code messaging
    4. error correction
  1. Which of the following is not true of Ethernet 802.3X flow control using PAUSE frames
    1. reception of the PAUSE frame stops the sender from transmitting frames for a specified period of time
    2. must operate on a full duplex links
    3. flow control is port based – that is, the sender stops sending all frames on the port
    4. uses a sliding window flow control method
  1. Which of the following Ethernet LAN physical layers operates at 100Mbps
    1. 10BaseT
    2. 100BaseT
    3. 1000BaseSX
    4. 10Base2
  1. Which of the following is an incorrect statement of CSMA/CD?
    1. It is the media access protocol used by 802.3 Ethernet.
    2. It supports error correction
    3. It has a distance limitation
    4. It requires a minimum frame size
  1. The principle reason why Ethernet collision domain distance is limited to ~2500m is due to
    1. Performance limitation of the physical layer components used on early NIC cards
    2. Enables the ability to detect a collision within the Ethernet timeslot duration
    3. Throughput reduction due to the propagation time
    4. Early ad hoc standard that evolved into a formal standard with no real technical reason
  1. Which of the following explanations is the best reason why ethernet hubs do not require a MAC address assignment at the physical port interfaces?
    1. Hubs do not participate in STP protocol
    2. Hubs are physical layer devices and do not perform MAC address filtering
    3. Hubs are physical layer devices and do not broadcast frames
    4. Hubs use a bridge id rather than MAC addresses
  1. The transmission delay to send a file size of 2000 bytes across a serial digital transmission channel operating at 10kbps is equal to:
    1. 2,000/10 seconds
    2. 10,000/(2000 x 8) seconds
    3. (2,,000 x 8)/10,000 seconds
    4. 2,000 x Vp (where Vp=propagation velocity) seconds
  1. STP protocol prevents which of the following problems that could arise with a physical loop topology in a switched Ethernet network
    1. signal interference
    2. frame collisions
    3. cross talk
    4. broadcast storm
  1. Which best explains the definition of slot time as applied to Ethernet?
    1. Slot time is thetime required to send the maximum sized Ethernet frame across a link
    2. Slot time is the Ethernet frame queuing delay within an Ethernet switch
    3. Slot time is the maximum round trip propagation time required to send an Ethernet frame across a collision domain
    4. Slot time is the time duration between BPDU control frames sent by the root bridge
  1. The maximum size of the 802.3 frame is _______ (excluding preamble, SFD and FCS).
    1. 64 bytes
    2. 1024 bytes
    3. 1500 bytes
    4. 65,536 bytes
  1. On a CSMA/CD Ethernet network, two stations send a frame at approximately the same time and a collision results. What is the probability that collision happens again at their second attempt?
    1. 12.5%
    2. 25%
    3. 50%
    4. 75%
  1. Transparent Ethernet switches learn MAC table entries principally through
    1. Flooding IP protocol packets throughout a subnet
    2. Flooding frames throughout a collision domain
    3. Flooding frames throughout a broadcast domain
    4. Network administrator enters the addresses in the table manually
  1. Which is the primary reason as to why the MAC table within an Ethernet switch is periodically cleared (that is, MAC table entries are periodically removed)
    1. The possibility that a host IP address associated with a specific MAC addresses may be changed by a LAN administrator
    2. Hosts may physically move from one Ethernet switch interface to a different Ethernet switch interface
    3. Reduce the queuing delay introduced in the Ethernet switch by emptying the queues
    4. Reduce the amount of Ethernet frames that flood within the broadcast domain
  1. Which of the following is NOT true of full duplex Ethernet links
    1. Does not utilize a collision backoff strategy
    2. Does not utilize Carrier sense
    3. Does not utilize Collision detection
    4. Maximum distance is limited to 2500m
  1. Ethernet auto-negotiates which of the following three parameter types used on a link
    1. duplexity, line rate, link protocol type
    2. duplexity, use of flow control, line rate
    3. port blocking/forwarding, duplexity, line rate
    4. use of flow control, duplexity, port blocking/forwarding
  1. Which of the following is true for direct packet delivery (that is, packet delivery occurs within a subnet)
    1. the underlying layers within the subnet are used to deliver the packet
    2. the default router must be used to deliver the packet
    3. the underlying layers + IP protocol within the subnet are used to deliver the packet
    4. the underlying layers + DNS server within the subnet are used to deliver the packet
  1. Which of the following best explains primary purpose of 802.1Q VLAN support?
    1. To flexibly divide a large collision domain into multiple ones.
    2. To flexibly divide a large broadcast domain into multiple ones
    3. To deliver frames from two separate subnets
    4. To support link aggregation
  1. A VLAN trunk is a
    1. link that supports one VLAN
    2. link that can carry multiple VLANs
    3. switch port connect to the internet
    4. data and voice capability on the same interface
  1. Suppose an Ethernet switch with sixteen ports has each port assigned to a different VLAN id. Which of the following statements is true.
    1. a frame received by one port can be forwarded to any different port
    2. there is one MAC forwarding table for this switch with sixteen rows, one for each VLAN
    3. the switch is divided into sixteen different subnets
    4. the switch connects sixteen different collision domains into one broadcast domain

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