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NEW QUESTION: 1
Secure Sockets Layer (SSL) uses a Message Authentication Code (MAC) for what purpose?
A. message integrity.
B. message non-repudiation.
C. message interleave checking.
D. message confidentiality.
Answer: A
Explanation:
A keyed hash also called a MAC (message authentication code) is used for integrity protection and authenticity.
In cryptography, a message authentication code (MAC) is a generated value used to authenticate a message. A MAC can be generated by HMAC or CBC-MAC methods. The MAC protects both a message's integrity (by ensuring that a different MAC will be produced if the message has changed) as well as its authenticity, because only someone who knows the secret key could have modified the message.
MACs differ from digital signatures as MAC values are both generated and verified using the same secret key. This implies that the sender and receiver of a message must agree on the same key before initiating communications, as is the case with symmetric encryption. For the same reason, MACs do not provide the property of non-repudiation offered by signatures specifically in the case of a network-wide shared secret key: any user who can verify a MAC is also capable of generating MACs for other messages.
HMAC When using HMAC the symmetric key of the sender would be concatenated (added at the end) with the message. The result of this process (message + secret key) would be put through a hashing algorithm, and the result would be a MAC value. This MAC value is then appended to the message being sent. If an enemy were to intercept this message and modify it, he would not have the necessary symmetric key to create a valid MAC value. The receiver would detect the tampering because the MAC value would not be valid on the receiving side.
CBC-MAC If a CBC-MAC is being used, the message is encrypted with a symmetric block cipher in CBC mode, and the output of the final block of ciphertext is used as the MAC. The sender does not send the encrypted version of the message, but instead sends the plaintext version and the MAC attached to the message. The receiver receives the plaintext message and encrypts it with the same symmetric block cipher in CBC mode and calculates an independent MAC value. The receiver compares the new MAC value with the MAC value sent with the message. This method does not use a hashing algorithm as does HMAC.
Cipher-Based Message Authentication Code (CMAC) Some security issues with CBC-MAC were found and they created Cipher-Based Message Authentication Code (CMAC) as a replacement. CMAC provides the same type of data origin authentication and integrity as CBC-MAC, but is more secure mathematically. CMAC is a variation of CBC-MAC. It is approved to work with AES and Triple DES. HMAC, CBC-
MAC, and CMAC work higher in the network stack and can identify not only transmission
errors (accidental), but also more nefarious modifications, as in an attacker messing with a
message for her own benefit. This means all of these technologies can identify intentional,
unauthorized modifications and accidental changes- three in one.
The following are all incorrect answers:
"Message non-repudiation" is incorrect.
Nonrepudiation is the assurance that someone cannot deny something. Typically,
nonrepudiation refers to the ability to ensure that a party to a contract or a communication
cannot deny the authenticity of their signature on a document or the sending of a message
that they originated.
To repudiate means to deny. For many years, authorities have sought to make repudiation
impossible in some situations. You might send registered mail, for example, so the
recipient cannot deny that a letter was delivered. Similarly, a legal document typically
requires witnesses to signing so that the person who signs cannot deny having done so.
On the Internet, a digital signature is used not only to ensure that a message or document
has been electronically signed by the person that purported to sign the document, but also,
since a digital signature can only be created by one person, to ensure that a person cannot
later deny that they furnished the signature.
"Message confidentiality" is incorrect. The Message confidentiality is protected by
encryption not by hashing algorithms.
"Message interleave checking" is incorrect. This is a nonsense term included as a
distractor.
Reference(s) used for this question:
Harris, Shon (2012-10-25). CISSP All-in-One Exam Guide, 6th Edition (p. 1384). McGraw-
Hill. Kindle Edition.
and
http://csrc.nist.gov/publications/nistpubs/800-38B/SP_800-38B.pdf
and
http://searchsecurity.techtarget.com/definition/nonrepudiation
and
https://en.wikipedia.org/wiki/Message_authentication_code
NEW QUESTION: 2
Siehe Ausstellung.
Der New Yorker Router ist mit statischen Routen konfiguriert, die auf die Standorte Atlanta und Washington verweisen. Welche beiden Aufgaben müssen ausgeführt werden, damit sich die Serial0 / 0/0-Schnittstellen der Router in Atlanta und Washington gegenseitig erreichen können?
(Wähle zwei.)
A. Konfigurieren Sie den Befehl ipv6 route 2023 :: / 126 2012 :: 1 auf dem Atlanta-Router.
B. Konfigurieren Sie den Befehl ipv6 route 2023 :: / 126 2012 :: 2 auf dem Atlanta-Router.
C. Konfigurieren Sie den Befehl ipv6 route 2012 :: / 126 2023 :: 1 auf dem Washington-Router.
D. Konfigurieren Sie den Befehl Ipv6 route 2012 :: / 126 s0 / 0/0 auf dem Atlanta-Router.
E. Konfigurieren Sie den Befehl ipv6 route 2012 :: / 126 2023 :: 2 auf dem Washington-Router.
Answer: B,E
Explanation:
Explanation
The short syntax of static IPv6 route is:ipv6 route <destination-IPv6-address> {next-hop-IPv6-address | exit-interface}
NEW QUESTION: 3
You are site surveying a network for VoWiFi. You have positioned an AP for a manual survey and are moving away from the AP with a phone in Survey Mode in your hand and you are reading the RSSI value of the signal received from the AP. You have previously determined that the noise floor was approximately -94 dBm on this floor of the building. The phone's documentation does not specify a recommended RSSI or SNR value for best performance.
Based on the information provided and the type of device (VoWiFi phone) you are deploying, what minimum RSSI should you plan for in all areas you are monitoring and where VoWiFi service is desired?
A. - 72 dBm
B. - 62 dBm
C. - 67 dBm
D. - 75 dBm
Answer: C
NEW QUESTION: 4
SIMULATION
Scenario:
You work for SWITCH.com. They have just added a new switch (SwitchB) to the existing network as shown in the topology diagram.
RouterA is currently configured correctly and is providing the routing function for devices on SwitchA and SwitchB. SwitchA is currently configured correctly, but will need to be modified to support the addition of SwitchB. SwitchB has a minimal configuration. You have been tasked with competing the needed configuring of SwitchA and SwitchB. SwitchA and SwitchB use Cisco as the enable password.
Configuration Requirements for SwitchA
The VTP and STP configuration modes on SwitchA should not be modified.
SwitchA needs to be the root switch for vlans 11, 12, 13, 21, 22 and 23.
All other vlans should be left are their default values.
Configuration Requirements for SwitchB
* Vlan 21
Name: Marketing
will support two servers attached to fa0/9 and fa0/10
* Vlan 22
Name: Sales
will support two servers attached to fa0/13 and fa0/14
* Vlan 23
o Name: Engineering
o will support two servers attached to fa0/15 and fa0/16
* Access ports that connect to server should transition immediately to forwarding state upon detecting the connection of a device.
* SwitchB VTP mode needs to be the same as SwitchA.
* SwitchB must operate in the same spanning tree mode as SwitchA
* No routing is to be configured on SwitchB
* Only the SVI vlan 1 is to be configured and it is to use address 192.168.1.11/24 Inter-switch Connectivity Configuration Requirements
* For operational and security reasons trunking should be unconditional and Vlans 1, 21, 22 and 23 should tagged when traversing the trunk link.
* The two trunks between SwitchA and SwitchB need to be configured in a mode that allows for the maximum use of their bandwidth for all vlans. This mode should be done with a non-proprietary protocol, with SwitchA controlling activation.
* Propagation of unnecessary broadcasts should be limited using manual pruning on this trunk link.
A. See for step by step solution:
hostname SWITCH_B
!
!
vlan 21
name Marketing
vlan 22
name Sales
vlan 23
name Engineering
!
!
interface FastEthernet0/3
switchport trunk allowed vlan 1,21-23
channel-protocol lacp
channel-group 1 mode passive
switchport mode trunk
!
interface FastEthernet0/4
switchport trunk allowed vlan 1,21-23
channel-protocol lacp
channel-group 1 mode passive
switchport mode trunk
!
interface FastEthernet0/9
switchport access vlan 21
!
interface FastEthernet0/13
switchport access vlan 22
switchport mode access
spanning-tree portfast
!
!
interface FastEthernet0/14
switchport access vlan 22
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/15
switchport access vlan 23
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/16
switchport access vlan 23
switchport mode access
spanning-tree portfast
!
interface Vlan1
ip address 192.168.1.11 255.255.255.0
!
end
SWITCH_B(config)#
hostname SWITCH_A
!
panning-tree vlan 11 root primary
spanning-tree vlan 12 root primary
spanning-tree vlan 13 root primary
spanning-tree vlan 21 root primary
spanning-tree vlan 22 root primary
spanning-tree vlan 23 root primary
!
interface FastEthernet0/22
switchport access vlan 22
switchport mode access
!
interface FastEthernet0/23
switchport access vlan 23
switchport mode access
!
interface GigabitEthernet1/1
!
interface GigabitEthernet1/2
!
interface Port-channel 1
!
interface Vlan1
no ip address
shutdown
!
ip default-gateway 192.168.1.1
!
!
End
B. See for step by step solution:
hostname SWITCH_B
!
!
vlan 21
name Marketing
vlan 22
name Sales
vlan 23
name Engineering
!
!
interface FastEthernet0/3
switchport trunk allowed vlan 1,21-23
channel-protocol lacp
channel-group 1 mode passive
switchport mode trunk
!
interface FastEthernet0/4
switchport trunk allowed vlan 1,21-23
channel-protocol lacp
channel-group 1 mode passive
switchport mode trunk
!
interface FastEthernet0/9
switchport access vlan 21
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/10
switchport access vlan 21
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/13
switchport access vlan 22
switchport mode access
spanning-tree portfast
!
!
interface FastEthernet0/14
switchport access vlan 22
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/15
switchport access vlan 23
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/16
switchport access vlan 23
switchport mode access
spanning-tree portfast
!
!
interface GigabitEthernet1/1
!
interface GigabitEthernet1/2
!
interface Port-channel 1
switchport mode trunk
switchport trunk encapsulation dot1q
spanning-tree allowed vlans 1,21-23
!
interface Vlan1
ip address 192.168.1.11 255.255.255.0
!
end
SWITCH_B(config)#
hostname SWITCH_A
!
panning-tree vlan 11 root primary
spanning-tree vlan 12 root primary
spanning-tree vlan 13 root primary
spanning-tree vlan 21 root primary
spanning-tree vlan 22 root primary
spanning-tree vlan 23 root primary
!
interface FastEthernet0/3
switchport trunk allowed vlan 1,21-23
channel-protocol lacp
channel-group 1 mode active
switchport mode trunk
!
interface FastEthernet0/4
switchport trunk allowed vlan 1,21-23
channel-protocol lacp
channel-group 1 mode active
switchport mode trunk
!
interface FastEthernet0/21
switchport access vlan 21
switchport mode access
!
interface FastEthernet0/22
switchport access vlan 22
switchport mode access
!
interface FastEthernet0/23
switchport access vlan 23
switchport mode access
!
interface GigabitEthernet1/1
!
interface GigabitEthernet1/2
!
interface Port-channel 1
!
interface Vlan1
no ip address
shutdown
!
ip default-gateway 192.168.1.1
!
!
End
Answer: B
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