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NEW QUESTION: 1
Which three of these statements about a zone-based policy firewall are correct? (Choose three.)
A. An interface can be assigned to only one security zone.
B. In order to pass traffic between two interfaces that belong to the same security zone, you must configure a pass action using class-default.
C. By default, all traffic to and from an interface that belongs to a security zone is dropped unless explicitly allowed in the zone-pair policy.
D. Firewall policies, such as the past, inspect, and drop actions, can only be applied between two zones.
E. Traffic cannot flow between a zone member interface and any interface that is not a zone member.
Answer: A,D,E
Explanation:
http://www.cisco.com/c/en/us/support/docs/security/ios-firewall/98628-zonedesign-guide.html
A -> An interface can be assigned to only one security zone. so it is correct B -> is just partially correct: All traffic to and from a given interface is implicitly blocked when the interface is assigned to a zone, except traffic to and from other interfaces in the same zone, and traffic to any interface on the router C -> Traffic cannot flow between a zone member interface and any interface that is not a zone member. Pass, inspect, and drop actions can only be applied between two zones. D -> Traffic is implicitly allowed to flow by default among interfaces that are members of the same zone; so D is not correct E -> Traffic cannot flow between a zone member interface and any interface that is not a zone member. Pass, inspect, and drop actions can only be applied between two zones.

NEW QUESTION: 2
Which of the following noise values would provide the weakest connection between an AP and a wireless client with an RSSI of -67 dBm?
A. -19 dBm
B. -38 dBm
C. -67 dBm
D. -83 dBmE. -91 dBm
Answer: A
Explanation:
Explanation/Reference:
Section: Considerations for Expanding an Existing Network Explanation
Explanation:
A noise value of -19 decibel milliwatts (dBm) would provide the weakest connection between an AP and a wireless client with a Received Signal Strength Indicator (RSSI) of -67 dBm. In a Voice over wireless LAN (VoWLAN), signal strength is measured in dBm, which is a measure of power normalized to 1 milliwatt (mW). Zero dBm indicates infinite signal strength, and negative values indicate decreased signal strength.
For example, -19 dBm is a stronger signal than -38 dBm. The signaltonoise ratio (SNR) describes the separation between a valid radio signal and any ambient noise. A wireless client with an RSSI of -67 dBm would require a noise value less than -67 dBm in order to separate signal from noise. A high SNR indicates that a device can easily distinguish valid signals from the surrounding noise. The greater the separation between signal and noise, the higher the likelihood that the wireless client will not experience packet loss due to signal interference.
Conversely, a lower SNR increases the likelihood that the wireless client will be unable to discern the signal. If the SNR is too low, the wireless client might not be able to distinguish some parts of the signal from the surrounding noise, which might result in packet loss. In this case, an RSSI of -67 dBm with a noise value of -19 dBm produces an SNR of -48 decibels (dB). A negative SNR value indicates that the strength of the noise is greater than the strength of the received signal, resulting in 100 percent packet loss. Cisco recommends maintaining a minimum signal strength of -67 dBm and a minimum SNR of 25 dB throughout the coverage area of a VoWLAN to help mitigate packet loss.
The sensitivity of an 802.11 radio decreases as the data rate goes up. Thus the separation of valid 802.11 signals from background noise must be greater at higher data rates than at lower data rates. Otherwise, the 802.11 radio will be unable to distinguish the valid signals from the surrounding noise. For example, an
802.11 radio might register a 1Mbps signal at -45 dBm with -96 dBm of noise. These values produce an SNR of 51 dB. However, if the data rate is increased to 11 Mbps, the radio might register a signal of -63 dBm with -82 dBm of noise, thereby bringing the SNR to 19 dB. Because the sensitivity of the radio is diminished at the higher data rate, the radio might not be able to distinguish parts of the signal from the surrounding noise, which might result in packet loss. Therefore, the optimal cell size is determined by the configured data rate and the transmitter power of the access point (AP).
Noise values of -38 dBm, -67 dBm, -83 dBm, and -91 dBm would not provide a connection weaker than the noise value of -19 dBm. Each of these values produces an SNR higher than the SNR obtained with a noise value of -19 dBm. Because the strength of a connection can be determined by its SNR, a noise value that produces the lowest SNR would provide the weakest connection.
Reference:
Cisco: Site Survey Guide: Deploying Cisco 7920 IP Phones: Getting started

NEW QUESTION: 3
When a Cisco IOS gatekeeper receives an LRQ, what is the first step it will take in an attempt to resolve the destination address?
A. Check to see if the destination address matches the technology prefix.
B. Check to see if the destination address matches the remote zone prefix.
C. Check to see if the destination address matches the hop-off technology prefix.
D. Check to see if the LRQ reject-unknown-prefix flag is set.
E. Check to see if the LRQ forward-queries flag is set.
Answer: A
Explanation:
Explanation
LRQ - These messages are exchanged between gatekeepers and are used for inter-zone (remote zone) calls.
For example, gatekeeper A receives an ARQ from a local zone gateway requesting call admission for a remote zone device. Gatekeeper A then sends an LRQ message to gatekeeper B.
Gatekeeper B replies to the LRQ message with either a Location Confirm (LCF) or Location Reject (LRJ) message, which depends on whether it is configured to admit or reject the inter-zone call request and whether the requested resource is registered.

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