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Infrastructure II Final
Georges Inf. final
48
Computer Networking
Not Applicable
03/21/2010

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Cards

Term
Put these DHCP messages in chronological order
DHCPOffer
DHCPAck
DHCPDiscover
DHCPRequest
Definition
Discover
Offer
Request
Ack
Term
When do DHCP clients renew their address lease?
Definition
After 50% of the time alotted has passed. If renewal is not achieved, then they retry again at 87.5%
Term
A DHCPDiscover packet has the source address of ____ and a destination address of 255.255.255.255
Definition
0.0.0.0
Term
T/F Most of the DHCP leasing packets are communicated through broadcast
Definition
False; they are all broadcast
Term
This DHCP leasing packet is sent when a client accepts one of the DHCPOffers by broadcast and asks for an address
Definition
DHCPRequest
Term
What must you install on a router to allow DHCP to serve out address information across subnets?
Definition
Relay Agent
Term
How many packets are involved in an address renewal process?
Definition
Two - DHCPRequest (client to server) and DHCPAck (server to client)
Term
How many packets are involved in an address renewal process?
Definition
Two - DHCPRequest (client to server) and DHCPAck (server to client)
Term
How many packets are involved in an address renewal process?
Definition
Two - DHCPRequest (client to server) and DHCPAck (server to client)
Term
How many packets are involved in an address renewal process?
Definition
Two - DHCPRequest (client to server) and DHCPAck (server to client)
Term
How many packets are involved in an address renewal process?
Definition
Two - DHCPRequest (client to server) and DHCPAck (server to client)
Term
How many packets are involved in an address renewal process?
Definition
Two - DHCPRequest (client to server) and DHCPAck (server to client)
Term
How many packets are involved in an address renewal process?
Definition
Two - DHCPRequest (client to server) and DHCPAck (server to client)
Term
What type of packets are used in a DHCP address renewal?
Definition
Unicast
Term
How can you force a DHCP address renewal?
Definition
ipconfig /renew
Term
What command can be used to break the bind between a NIC and a DHCP address?
Definition
ipconfig /release
Term
In short, what is the 80/20 rule?
Definition
80% of DHCP addresses (scope) are managed by the primary DHCP server, the remaining 20% are managed by a secondary DHCP server
Term
How do Relay Agents forward broadcasted DHCP information?
Definition
They translate the broadcasts into unicast packets so that they can traverse between subnets
Term
T/F Server options apply to all scopes on the DHCP server, scope options are specific to a per scope basis.
Definition
True
Term
T/F When there is a conflict between server options and scope options, the server options take precedence.
Definition
False
Term
What does the IPSec policy agent do?
Definition
Loads the IPSec policy
Term
Where are local IPSec policies stored?
Definition
In the registry of the local machine
Term
Where are domain-member IPSec policies stored?
Definition
In AD and cached in the local registry to the client in which it applies to
Term
IPSec
Which IPSec mode provides end -to-end security between devices?
Definition
Transport Mode
Term
IPSec
Which mode is used by L2TP, VPN's, and Remote Access?
Definition
TRansport Mode
Term
_____ mode encrypts only the data portion (payload) of each packet
Definition
Transport
Term
IPSec
Which mode provides secure communications between two networks through a single node?
Definition
Tunnel mode
Term
IPSec
Which mode encrypts both the header and the payload of each packet?
Definition
Tunnel Mode
Term
T/F Public keys unlock Private keys
Definition
False; Private unlocks public
Term
T/F The FEK is used to unencrypt files after it unlocks the public key which encrypted it
Definition
False; the private key unlocks the public key which unlocks the FEK. Then the FEK is usde to decrypt the file
Term
IPSec
Which mode is used for a site-to-site scenario?
Definition
Tunnel. Think network to network
Term
IPSec
Which mode is used in a Client-to-Client scenario?
Definition
Transport. Think end to end devices
Term
Main mode/Phase 1 deals with establishing authentication between two end points. What are the methods that are used in this mode?
Definition
Kerberos, Digital Certificates, and PSK's
Term
This security (encryption) method provides authentication, integrity, and confidentiality services
Definition
Encapsulating Security Payload (ESP)
Term
Unlike ESP, this security (encryption) method does not provide encryption of data, nor does it traverse NAT devices
Definition
Authentication Header
Term
IP filter, IP filter list, Filter Action, Security Method, Connection type, Tunnel Setting, and Rule are all components of what?
Definition
IPSec
Term
Which kind of encryption is a two way hash algorythm?
Definition
SHA1
Term
Out of these three, which is the most secure? Least secure?
PSK
Kerberos
Digital Certificates
Definition
PSK (Least)
Digital Certificate (Most)
Term
How large of a key is used by DES (Data Encryption Standard)?
Definition
56 bit
Term
How large of a key is used by 3DES?
Definition
256 bit
Term
44. Which IPSec component actually encrypts the data?
Definition
ESP (Encapsulating Security Payload)
Term
What is L2TP most often combined with to add security to the user account as well as the computer account?
Definition
IPSec
Term
T/F L2TP requires a PKI?
Definition
True
Term
Which OSI layer does IPSec work on?
Definition
Layer 3
Term
T/F The FEK has asymmetric encryption
Definition
False; it is symmetric... it is a single key. Symmetric keys are the combination of a private and a public
Term
Where is the FEK stored, other than in the DRF?
Definition
DDF Data decryption field
Term
T/F Public Keys encrypt while Private Keys decrypt
Definition
True
Term
What is an upstream server, in regards to WSUS?
Definition
It is a server in which other servers are getting their updates from.
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