CCNA 3 Flashcards
Which network topology allows all traffic to flow through a central hub
star
What is true about Ethernet
802.3 protocol
10Base T half duplex
If a router has 3 hosts connected in one port and two other hosts connected in another port, how may broadcast domains are present on the router
2
On which type of device is every port in the same collision domain
a hub
Which MTU size can cause a baby giant error
1518
What are three characteristics of the TCP protocol
The connection is established before data is transmitted.
It ensures that all data is transmitted and received by the remote device.
It uses seperate SYN and ACK messages to establish a connection
A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port?
This is an Ethernet port operating at half duplex
Which three elements are fields in a basic Ethernet data frame?
Preamble
Type/length
Frame check sequence
What interconnection cable can you use when you use a MDI connection?
Crossover
for what two purposes does the Ethernet protocol use physical addresses
To uniquely identify devices at Layer 2
to allow communication between different devices on the same network
In an Ethernet network, under what two scenarios can devices transmit?
When they detect no other devices are sending
When the medium is idle
How many broadcast domains are shown in the graphic assuming only the default VLAN is configured on the switches?
1
Which statement about upgrading a Cisco IOS device with TFTP server
the operation is performed in encrypted format
Which two options are fields in an Ethernet frame?
frame check sequence
type
Which two statements about UDP are true?
It can transmit data at a rate higher than the path capacity
It can be used for multicast and broadcast traffic
Which two statements about fiber cable are true?
Single-mode cable is most appropriate for installations longer 10 km
Multi-mode cable supports speeds between 100 Mbps and 100 Gbps
Which statements correctly describe steps in the OSI data encapsulation process?
The transport layer divides a data stream into segments and may add reliability and flow control information
Packets are created when the network layer adds Layer 3 addresses and control information to a segment.
What layers of the OSI Model is included in TCP/IP Model’s INTERNET layer?
Network
Where does routing occur within the DoD TCP/IP reference model?
internet
Which of the following correctly describe steps in the OSI data encapsulation process
The transport layer divides a data stream into segments and may add reliability and flow control information.
Packets are created when the network layer adds Layer 3 addresses and control information to a segment.
Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication?
application
Which networking technology is currently recognized as the standard for computer networking?
Transmission
Which three encapsulation layers in the OSI model are combined into the TCP/IP application layer?
Session
Presentation
Application
On which layer TCP/IP is ACL APIC-EM path
Layer 4(Application layer)
which option is the benefit of implementing an intelligent DNS for a cloud computing solution?
It can redirect user requests to locations that are using fewer network resources.
What are the three major components of Cisco network virtualization
network access control
path isolation
virtual network services
Which three technical services support cloud computing?
layer 3 networking routing
ip localization
extended SAN services
Which major component of the network virtualization architecture isolate users according to policy?
network access control
Which three options are the major components of a network virtualization architecture?
Virtual network services
network access control
path isolation
Which cloud service is typically used to provide DNS and DHCP services to an enterprise?
IaaS (Infrastructure as a service)
Which command can you enter to determine whether serial interface 0/2/0 has been configured using HDLC encapsulation?
router#show interfaces S0/2/0
Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mechanisms?
PPP (Point to point protocol)
Which statements about using leased lines for your WAN infrastructure are true?
Leased lines with sufficient bandwidth can avoid latency between endpoints.
Leased lines require little installation and maintenance expertise.
Which of the following describes the roles of devices in a WAN?
A CSU/DSU (channel service unit/data service unit) terminates a digital local loop
A modem terminates an analog local loop
A router is commonly considered a DTE (Data terminal equipment) device
Which two pieces of information are provided by the “show controllers serial 0” command?
The type of cable that is connected to the interface
the status of the physical layer of the interface
Which command is used to know the duplex speed of serial link?
Show interface
Which WAN topology provides a direct connection from each site to all other sites on the network
full mesh
What are three reasons that an organization with multiple branch offices and roaming users might implement a Cisco VPN solution instead of point-to-point WAN links?
reduced cost
increased security
scalability
True or False:
DWDM (dense wavelength division multiplexing) allows a single strand of fiber to support bidirectional communications
True
True or False:
DWDM (dense wavelength division multiplexing) is used for long-distance and submarine cable systems
True
True or False:
DWDM (dense wavelength division multiplexing) supports both the SDH and SONET standards
True
True or False:
DWDM (dense wavelength division multiplexing)can multiplex up to 256 channels on a single fiber
False
True or False:
DWDM (dense wavelength division multiplexing)can carry up to a 1-Gbps signal on each channel
False
True or False:
DWDM (dense wavelength division multiplexing) supports simplex communications over multiple strands of fiber
False
which PPP subprotocol negotiates authentication options?
LCP (Link control protocol)
Which benefit of implementing a dual-homed WAN connection instead of a single-homed connection is true?
Only dual-homed connections enable an individual router to tolerate the loss of a network link
Which two statements about using the CHAP authentication mechanism in a PPP link are true?
CHAP (Challenge handshake authentication protocol) uses a three-way handshake
CHAP authentication periodically occurs after link establishment.
A network administrator needs to configure a serial link between the main office and a remote location. The router at the remote office is a non-Cisco router. How should the network administrator configure the serial interface of the main office router to make the connection?
Main(config)# interface serial 0/0
Main(config)#ip address 172.16.1.1 255.255.255.252
encapsulation ppp
no shut
What is the benefit of point-to-point leased line?
simply configuration
When you deploy multilink PPP on your network, where must you configure the group IP address on each device?
Under the multilink interface
What are two authentication types of MLPPP (Multilink PPP)
PAP (password authentication protocol)
CHAP
At which layer of the OSI model does PPP perform?
Layer 2 (Data layer)
Which command is used to enable CHAP authentication with PAP as the fallback method on a serial interface?
(config-if)# ppp authentication chap pap
Which two authentication methods are compatible with MLPPP on a serial interface?
CHAP
PAP
Which statement about QoS default behavior is true?
Packets that arrive with a tag are untagged at the edge of an administrative domain.
What 8-bit field exists in IP packet for QoS?
Tos Field
Which feature can you implement to reserve bandwidth for VoIP calls across the call path?
RSVP
What does traffic shaping do to reduce congestion in a network?
buffers and queues packets
in which byte of an IP packet can traffic be marked?
the ToS byte
Which function does traffic shaping perform?
It buffers and queues excess packets
Which option is the main function of congestion management
queuing traffic based on priority
Which QoS tool can you use to optimize voice traffic on a network that is primarily intended for data traffic
PQ (Performance quality)
Which two QoS tools can provide congestion management
CBWFQ (class based weighted fair queuing) PQ
Which function does traffic shaping perform?
It bufferes and queues excess packets
