Cisco 642-457 Online Practice Questions and Exam Preparation

Cisco 642-457 Online Questions & Answers

• Question 181:

  Which two statements about symmetric encryption are true? (Choose two.) (SourcE. Understanding Cryptographic Fundamentals)

  A. With symmetric encryption, the encryption key equals the decryption key.
  B. Symmetric encryption is commonly used to sign asymmetric keys.
  C. Symmetric encryption is a good choice for real-time encryption of bulk data.
  D. Symmetric encryption uses asymmetric keys.
  A. With symmetric encryption, the encryption key equals the decryption key.
  C. Symmetric encryption is a good choice for real-time encryption of bulk data.

• Question 182:

  The following exhibit shows configs for H.323 gateway. You have been asked to implement TEHO from a remote branch office with area code 301 to the HQ office with area code 201 using Cisco Unified Communications Manager. The remote office has an MGCP gateway and the HQ office has an H.323 gateway. Once the call arrives at the HQ, it should break out to the PSTN as a seven-digit local call. Which statement about the route pattern is true?

  

  A. route pattern should be 91201.[2-9]XXXXXX with Discard Digit as Predot and Prefix 9
  B. route pattern should be 91201.[2-9]XXXXXX with Discard Digit as Predot
  C. route pattern should be 91201.[2-9]XXXXXX
  D. route pattern should be 9.1201[2-9]XXXXXX with Discard Digit as Predot
  E. route pattern should be 9.1201[2-9]XXXXXX with Discard Digit as Predot and Prefix 9
  A. route pattern should be 91201.[2-9]XXXXXX with Discard Digit as Predot and Prefix 9

• Question 183:

  Refer to the exhibit.

  

  The exhibit shows centralized Cisco Unified Communications Manager configuration components for TEHO calls to U.S. area code 408 from the U.K. The PSTN access code for the K. is 9 and 001 for international calls to the U.S. Assuming the PSTN does not accept globalized numbers with + prefix. What should the Called Party Transformation Pattern at the S. gateway be configured as?

  A. \+.! with the following Called Party Transformation: Discard Digits PreDot Prefix Digits Outgoing Calls: +
  B. \+1.! with the following Called Party Transformation: Discard Digits PreDot Prefix Digits Outgoing Calls: None
  C. \+408.! with the following Called Party Transformation: Discard Digits PreDot Prefix Digits Outgoing Calls: 1
  D. \+1408.! with the following Called Party Transformation: Discard Digits PreDot Prefix Digits Outgoing Calls: None
  E. \+1.408! with the following Called Party Transformation: Discard Digits PreDot Prefix Digits Outgoing Calls: None
  D. \+1408.! with the following Called Party Transformation: Discard Digits PreDot Prefix Digits Outgoing Calls: None

• Question 184:

  Which E.164 transformation pattern represents phone numbers in Germany?

  A. \+49.!
  B. 49.!
  C. \49.!
  D. \+49.X
  A. \+49.!

• Question 185:

  Refer to the exhibit.

  

  What music on hold audio source will be heard if a user at extension 1372 places the user at extension 3041 on hold?

  A. moh2.au
  B. moh1.wav
  C. default.wav
  D. moh2.wav
  E. moh1.au
  E. moh1.au

• Question 186:

  While operating in SRST, what is needed to route calls outside of the remote site location to the PSTN?

  A. SIP trunk
  B. CallManager route patterns
  C. translation patterns
  D. POTS dial peers
  E. VOIP dial peers
  D. POTS dial peers

• Question 187:

  What is an advantage of TEHO?

  A. TEHO implemented with ISRs eliminates PSTN toll charges.
  B. TEHO implemented with ISRs can reduce PSTN toll charges.
  C. TEHO implemented with AAR reduces toll charges.
  D. TEHO implemented with CFUR reroutes calls.
  B. TEHO implemented with ISRs can reduce PSTN toll charges.