fixed header size
smaller header size
fewer header fields
variable header size
Which process plays a major role in the creation of the CEF adjacency table？ （）A、Address Resolution Protocol （ARP）B、PDU header rewriteC、NetFlow switchingD、hello packet exchange
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Which statement is true about IP telephony calls？（）A、 A Voice over IP （VoIP） packet consists of the voice payload， IP header， TCP header， RTP header， and Layer 2 link header.B、 The voice carrier stream uses H323 to set up， maintain， and tear down call endpoints.C、 Call control signaling uses Real-Time Transport Protocol （RTP） packets that contain actual voice samples.D、 The sum of bandwidth necessary for each major application， including voice， video， and data， should not exceed 75 percent of the total available bandwidth for each link.
What are two reasons for packet loss on a VoIP connection？（）A、serialization delayB、overrunC、full buffers and queuesD、propagation delayE、shaping delayF、TCP header errors
Which two statements about an interface configured with the asr-group command are correct?（）A、The FWSM supports up to 16 asymmetric routing groups.B、If a matching packet is not found, the packet is dropped.C、Asymetric routing of return traffic is enabled.D、If a matching packet is found, the Layer 3 header is rewritten.E、If a matching packet is found, the Layer 3 header is rewritten and the packet is forwarded to the default gateway.
Which statement correctly describes the disabling of IP TTL propagation in an MPLS network？（）A、The TTL field from the IP packet is copied into the TTL field of the MPLS label header at the ingress edge LSRB、TTL propagation cannot be disabled in an MPLS domainC、TTL propagation is only disabled on the ingress edge LSRD、The TTL field of the MPLS label header is set to 255E、The TTL field of the IP packet is set to 0
What are the DSL-specific factors that require additional bandwidth when supporting Voice-over-IP over an IPSec VPN?（）A、A voice packet is sent via multiple fixed-length cells; a portion of the last cell is padding, requiring more bandwidth.B、ADSL typically uses PPPoE encapsulation, which adds additional overhead to each voice packet.C、A voice packet is sent via multiple fixed-length cells; each cell has about 10% Layer-2 header overhead. D、IPSec requires additional overhead for the header and hash. E、ADSL carrier band requires additional bits to be carried over the wire to the DSL Access Concentrator.
Which three statements are true about TACACS+？（）A、It is a Cisco proprietary protocol.B、It runs on TCP port 59. .C、Authentication and authorization are done at different stages.D、TACACS+ encrypts the entire body of the packet， but leaves a standard TACACS+ header.E、It is an industry standard protocol.F、TACACS+ encrypts both the entire body of the packet and the TACACS+ header.
