When designing an expansion within the same data center, when is a pre-sales TDA absolutely required by IBM?（）

A . only the low-order 23 bits of the MAC address are used to map IP addresses B . only the low-order 24 bits of the MAC address are used to map IP addresses C . only the high-order 23 bits of the MAC address are used to map IP addresses D . only the low-order 23 bits of the IP address are used to map MAC addresses E . the 0x01004f MAC address prefix is used for mapping IP addresses to MAC addresses F . the 0x01005e MAC address prefix is used for mapping IP addresses to MAC addresse

A . detachable link B . stud link C . Kenter link D . connection link

A .  A

A . Never use passive interfaces. B . Use NSSA areas from the core down. C . Use totally stub areas to stop type 3 LSAs. D . Use the lowest Ethernet interface IP address as the router ID. E . Tune OSPF timers to enable OSPF to achieve quicker convergence.

A .  Filtering is only useful when combined with route summarization B .  It is best to filter （allow） the default and summary prefixes only in the Enterprise Edge to remotesites or site-to-site IPsec VPN networks C .  IGPs （for example EIGRP or OSPF） are superior to route filtering in avoiding in inappropriatetransit traffic through remote nodes or inaccurate or inappropriate routing updates D .  The primary limitation of router filtering is that it can only be applied on outbound update

A . forms B . views C . roles D . agent

A . high availability B . strengthened security C . improved connectivity options D . continuity of service

A .  Never use passive interfaces. B .  Use NSSA areas from the core down. C .  Use totally stub areas to stop type 3 LSAs. D .  Use the lowest Ethernet interface IP address as the router ID. E .  Tune OSPF timers to enable OSPF to achieve quicker convergence

A .  dispersion B .  Optical SNR C .  span attenuation D .  four wave mixing E .  receiver sensitivity

A . Layer 2 access link QoS design B . enterprise-to-service-provider mapping models C . Layer 3 link access QoS design D . service provider service level agreements E . Layer 2 link access load balancing

A .  Summarize data center subnets. B .  Use passive interfaces to ensure appropriate adjacencies. C .  Tune the EIGRP timers to enable EIGRP to achieve quicker convergence. D .  Adjust the default bandwidth value to ensure proper bandwidth on all links. E .  Advertise a default summary route into the data center core from the aggregation layer.

A .  Routing is mostly static. B .  Hardcoded IP addresses are used to support failover. C .  Inbound servers use the CSM or ACE as the default gateway. D .  VLANs between the access layer switches are used for FHRP protocols.

A . only the low-order 23 bits of the MAC address are used to map IP addresses B . only the low-order 24 bits of the MAC address are used to map IP addresses C . only the high-order 23 bits of the MAC address are used to map IP addresses D . only the low-order 23 bits of the IP address are used to map MAC addresses E . the 0x01004f MAC address prefix is used for mapping IP addresses to MAC addresses F . the 0x01005e MAC address prefix is used for mapping IP addresses to MAC addresse

A .  OSPF stub areas increase the size of the LSDB with the addition of Type 3 and 5 LSAs B .  OSPF not so stubby areas are particularly useful as a simpler form of summarization C .  OSPF stub areas are always insulated from external changes D .  OSPF totally stubby cannot distinguish among ABRs for the best route to destinationsoutsidethe areas E .  OSPF stub areas can distinguish among ASBRs for destinations that are external to the OSPFdomai

A .  Eliminate the management and support for redistribution by choosing and cutting over to asingle IGP at the time of merger B .  Maintain distinct pockets across a moving boundary of routing protocols， redistributing betweenthem C .  Manipulate the administrative distance of the different IGPs to be equal throughout the network D .  Leave the IGPs independent without redistribution wherever communication between companyentities is not required

A . Routing is mostly static. B . Hardcoded IP addresses are used to support failover. C . Inbound servers use the CSM or ACE as the default gateway. D . VLANs between the access layer switches are used for FHRP protocols.

A . detailed VLAN information B . an incident response plan C . results of testing the new network configuration D . an existing hierarchical network topology E . a security policy for your organizatio

A . dispersion B . Optical SNR C . span attenuation D . four wave mixing E . receiver sensitivity

A、Number of the tourists. B、Tour destination. C、Traveling season or time. D、Traveling budget.

A．developmental design B．adaptive design C．variant design D．normal design E．electromechanical complementary method