Review Questions Flashcards
Which layer of the OSI Seven-layer model keeps track of a system’s connections to send the right response to a computer?
Session Layer (Layer 5 (L5)
Which layer of the TCP/IP model controls the segmentation and reassembly of data?
Transport Layer (Layer 4 (L4))
A frame ends with a special bit called the Frame Check Sequence (FCS). What does the FCS do?
Verifies that the data arrived correctly.
Which MAC Address begins a frame?
Receiving System
A NIC sends data in discrete chunks called ____
Frames
What Windows Utility do you use to find the MAC address for a system?
ipconfig /all
What Uniquely identifies every NIC?
MAC Address
A MAC Address is known as a ___ address
Physical
Where does a hub send data?
To all the systems connected to the hub
Which Topology required termination?
Bus Topology
Star-bus is an example of a ___ Topology
Hybrid Topology
Which Topology is fault tolerant?
Star Topology
What term is used to describe the interconnectivity of network components?
Topology
Coaxial cables all have an ___ rating
Ohm
An RG-59 is an example of what type of cable?
Coaxial
Which network topology connected nodes with a ring of cable?
Ring Topology
Which network topology is most commonly seen only in wireless networks?
Mesh Topology
LC is what type of connection?
Duplex Fiber-Optic Connection
What is the most common category of UTP used in new cabling installations?
Cat 6
Ethernet hubs take an incoming packet and ___ it out to the other connected ports
Repeat
What is appended to the beginning of an Ethernet Frame?
Preamble
What type of bus does 10BaseT use?
Star-Bus Topology
What is the maximum distance that can separate a 10BaseT node from its hub?
100 Meters
When used for Ethernet, UTP uses what type of connector?
RJ-45
What is the maximum number of nodes that can be connected to a 10BaseT hub?
1024 Nodes
What type of connectors are used by 10BaseFL cables?
SC and ST
Which networking devices can use the Spanning Tree Protocol? (STP)
Switches
What device directs packets based on MAC Addresses?
Switches
With 100BaseT, what is the maximum distance between the hub/switch and the node?
100 Meters
What type of cable and connector does 100BaseFX use?
Multimode Fiber with ST or SC Connectors
How many pairs of wires do 10BaseT and 100BaseT use?
Two Pairs
What standard does IEEE 802.3ab describe?
1000BaseT
What is the big physical difference between 1000BaseSX and 100BaseFX?
100BaseFX doesn’t allow the use of SC Connector
What is the maximum distance of 1000BaseLX without repeaters?
5km/5000m
What is the big advantage to using fiber-optic cable?
Fiber is not affected by EMI
How many wires does 1000BaseT use?
Four Pairs
What is the maximum cable length of 10GBaseT on Cat 6?
55 Meters
What is ‘bonding’ used for?
Allows the use of multiple NICs to achieve faster Network Speeds
How many pairs of wires are in a Cat 5e rated cable?
Four pairs
A ___ organizes and protects the horizontal cabling in the telecommunications room
Patch Panel
What are Patch cables used for?
To connect the patch panel to the switch and to connect PCs to Outlet boxes
Which network technology uses UTP cabling in a star topology?
100BaseT
Jane needs to increase network throughput on a 10BaseT network that consists of 1 hub and 30 users. Which of the following hardware solutions would achieve this most inexpensively?
Replace the hub with a Switch
What two devices together enable you to pick a single cable out of a stack of cables?
Tone Generator and Tone Probe
Rack mounted equipment has a height measured in what units?
U = units
How many bits does an IPv4 address consist of?
32 bits
Identify the network ID section of the following IP Address and Subnet Mask: 10.14.12.43/255.255.255.0
10.14.12
What does ARP stand for?
Address Resolution Protocol
Identify the class of the following IP Address: 146.203.143.101
Class B
What does IANA stand for?
Internet Assigned Numbers Authority
What is the maximum number of hosts in a /19 subnet?
8190
What is the number 138 in binary?
10101010
When DHCP fails, what process will the client use to generate an address for itself?
APIPA (Automatic Private IP Addressing)
127.24.0.1 is an example of what?
A valid Loopback address.
What is a router?
A piece of hardware that forwards packets based on IP Address
Routers must use the same type of connection for all routers, such as Ethernet to Ethernet or ATM to ATM. True or False?
False. A router can interconnect different layer 2 technologies
What technology allows you to share a single public IP address with many computers?
Port Address Translation
Distance vector routing protocols such as RIP rely on what metric to determine the best route?
Hop Count
What are two big advantages to using OSPF over RIP?
OSPF chooses routes based on link speed, not hop count and OSPF sends only routing table changes, reducing Network traffic.
What is ‘Area 0’ called in OSPF?
Backbone
What is the name of the cable that you use to connect to the console port on Cisco Routers?
Yost cable (This was invented to standardize the serial console interface, to connect to the console port on Cisco routers)
When first setting up a new router, you should never plug it into an existing network. True/False?
True. Never plug a new router into an existing network.
Traceroute utility is useful for?
Traceroute is useful for discovering information about routers between you and the destination address.
The protocol developed by Netscape for transmitting private documents over the internet is known as…
SSL (Secure Socket Layer)
An SSL/TLS URL connection starts with which prefix?
HTTPS
Why might you use the netstat utility?
To see the endpoints of your sessions
Why might you use a Telnet client?
To issue commands to a remote server
Port 110 (POP) is what kind of port?
Well-known Port
What ports does FTP use traditionally?
Port 20 and 21
Which two protocols are used to receive email from servers?
IMAP and POP
NetBIOS uses what type of name space?
Flat name space
The DNS root directory is represented by what symbol?
A dot
What command do you run to see the DNS cache on a Windows system?
ipconfig /displaydns
The users on your network haven’t been able to connect to the server for 30 minutes. You check and reboot the server, but you’re unable to ping either its own loopback address or any of your client systems. What should you do?
Replace the NIC because it has failed.
A User calls to say she can’t see the other systems on the network when she looks in ‘my network places’. You are not using NetBIOS. What are your first two troubleshooting steps?`
Ping the loopback address to test the NIC and Ping several neighbouring systems using both DNS names and IP Addresses.
What is checked first when trying to resolve an FQDN to an IP Address?
Hosts File
What type of DNS record is used by mail servers to determine where to send email?
MX Record
Running which command enables you to reset the DNS cache?
ipconfig /flushdns
Running which command enables you to query the functions of a DNS Server?
nslookup
Any encryption that uses the same key for encryption and decryption is called
Symmetric Key encryption
RC4 is a ___ cipher
Stream
In a PKI encryption method, which key encrypts the data?
Public Key
The Process of verifying with a high degree of confidence that the sender is who the receiver thinks he or she should be is called ____
nonrepudiation
A hash function is by definition a _____
One-way function
In order to have a PKI you must have a ____
Root authority
Which type of access control requires a label to define its sensitivity?
Mandatory Access Control must use a label to define sensitivity
If you saw some traffic running on UDP ports 1812 and 1813, what AAA standard would you know was running?
RADIUS uses UDP ports 1812 and 1813
Which authentication standard is highly time sensitive?
Kerberos
Which VPN Technology enables direct connections between satellite locations?
DMVPN (Dynamic Multipoint Virtual Private Network)
A static VLAN assigns VLANs to _____
Ports
Which of the following is the trunking protocol used in today’s VLAN’s?
802.1Q
A content switch always works at least at which layer of the OSI Model?
Layer 7 (Application)
When the network is very busy, VoIP calls start to sound badly clipped. What solution might improve the quality of the VoIP calls?
Traffic Shaping
What are the two benefits of caching on a web proxy?
Response Time
Virus Detection
802.1X is a great example of _____
Port authentication
What’s the most common method used to configure a VLAN-Capable switch?
Log into the switch using SSH and use the CLI
What is an IDS?
An IDS inspects a copy of all traffic in a network and can respond to detected intrusions with actions.
DHCP is required to receive an IPv6 address automatically?
False
What kind of DNS records do IPv6 addresses use?
AAAA
Is NAT needed for IPv6
NAT is no longer needed because of the massive size of the IPv6 address space.
What does a client need to access IPv6 content on the internet?
A global unicast address
What is the /16 prefix for all 6to4 address?
The /16 prefix designated by the IANA for all 6to4 addresses is 2002
Which Operating System has Teredo built in?
Windows
What service do tunnel brokers provide?
A way for users to jump the gap between their computers and the IPv6 internet routers
What is the /48 prefix of the address 2001:0480:b6f3:0001::0001
2001:480:b6f3
What is the signal rate for DS0?
64Kbps
What provides the fastest throughput?
ADSL (can run up to 15Mbps)
What is the popular Microsoft Remote Access Server program called?
RRAS (Routing and Remote Access Service)
What device do you use to connect to a T1 line?
CSU/DSU is required to connect to a T1 Line
BRI ISDN uses ____
2 B channels and 1 D channel
The V.90 standard defines a modem speed of ____
56Kbps
You have just had DSL installed at your house. Although the internet connection is fast, your phones no longer work. What is the Problem?
The installer failed to fit the POTS filters on the phones.
What protocol do cable modems use?
DOCSIS (Data Over Cable Service Interface Specification)
