Which of these terms refers to call issues that cause variations in timing or time of arrival？（）

多项选择题Refer to the exhibit. Which two of these are correct regarding the recommended practice for distribution layer design？（）

A.use a redundant link to the core
B.use a Layer 2 link between distribution switches
C.never use a redundant link to the core because of convergence issues
D.use a Layer 3 link between distribution switches with route summarization
E.use a Layer 3 link between distribution switches without route summarization

单项选择题You are the Cisco Network Designer in Cisco.com. Which of these statements is true of clientless end-user devices?（）

A. They do not receive unique IP addresses.
B. RADIUS or LDAP is required.
C. They are assigned addresses from the internal DHCP pool.
D. Their traffic appears to originate from the originating host network.

多项选择题What are two design guidelines for VoIP networks? （）

A.Delay should be no more than 10 ms.
B.Loss should be no more than1 percent.
C.Jitter should be less then 40 ms.
D.Managed bandwidth is strongly recommended for voice control traffic.

多项选择题WhichthreeoftheseareelementsoftheCiscoUnifiedWirelessNetworkarchitecture？（）

A.cell phones
B.remote access
C.mobility services
D.network management
E.network unification
F.network decentralization

单项选择题WhichoftheseisaLayer2transportarchitecturethatprovidespacket-basedtransmissionoptimizedfordatabasedonadual（counter-rotating）ringtopology？（）

A.DTP
B.RPR
C.SDH
D.CWDM
E.DWDM