Which three MPLS statements are true？（）

A . Out-of-profile packets are queued. B . It causes TCP retransmits. C . Marking and remarking are not supported. D . It does not respond to BECN and foresight messages. E . It uses a single- and two-bucket mechanism for metering.

A . Multicast addresses 224.0.0.0 through 224.0.0.255 are always forwarded because they are transmitted  with Time to Live （TTL） greater than 1. B . Multicast addresses 224.0.0.5 and 224.0.0.6 are source multicast addresses for OSPF routers. C . Multicast addresses 224.0.0.13 and 224.0.0.22 are reserved link-local addresses used by PIMv2 and  IGMPv3. D . Because they would map to overlapping IP multicast MAC addresses， multicast addresses 224.0.1.1  and 238.1.1.1 could not be used together. E . Multicast address 224.0.1.1 has been reserved for the Network Time Protocol （NTP） by the IANA F . The administratively scoped multicast addresses 239.0.0.0 through 239.255.255.255 are similar in  purpose to RFC 1918 private unicast addresses.

A . Default MDT groups are used for PIM control traffic， low-bandwidth sources， and flooding of sparse mode traffic. B . MDTs are built in customer networks C . Data MDT groups are used for high-bandwidth sources to reduce replication to uninterested PEs. D . MDTs are built in provider networks E . The number of MDTs depends on PIM modes of MDT groups.

A . A value of 4 represents the "Implicit NULL Label." B . A value of 0 represents the "IPv4 Explicit NULL Label." C . A value of 1 represents the "Router Alert Label". The use of this label is analogous to the use of the"Router Alert Option" in IP packets （for example， ping with record route option） D . A value of 2 represents the "IPv6 Explicit NULL Label" E . A value of 1 represents the "IPv1 Explicit NULL Label" F . A value of 3 represents the "Implicit NULL Label&quot

A . RSTP significantly reduces topology reconverging time after a link failure. B . RSTP expends the STP port roles by adding the alternate and backup roles. C . RSTP port states are blocking，discarding，learing，or forwarding. D . RSTP also uses the STP proprsal-agreement sequence. E . RSTP use the same timer-baseed process as STP on point-to-point links. F . RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.

A . Asinglerowsubquerycanretrieveonlyonecolumnandonerow. B . Asinglerowsubquerycanretrieveonlyonerowbutmanycolumns. C . Amultiplerowsubquerycanretrievemultiplerowsandmultiplecolumns. D . Amultiplerowsubquerycanbecomparedusingthe"；>；"；operator. E . AsinglerowsubquerycanusetheINoperator. F . Amultiplerowsubquerycanusethe"；="；operator.

A . LDP notification B . L2TPv3 session C . VPN route target communities D . Multiprotocol BGP peering of PE routers E . MPLS forwarding

A . Subqueries can contain GROUP BY and ORDER BY clauses  B . Main query and subquery can get data from different tables  C . Main query and subquery must get data from the same tables  D . Subqueries can contain ORDER BY but not the GROUP BY clause  E . Only one column or expression can be compared between the main query and subquery F .  Multiple columns or expressions can be compared between the main query and subquery

A . RSTP significantly reduces topology reconverging time after a link failure. B . RSTP expends the STP port roles by adding the alternate and backup roles. C . RSTP port satates are blocking,discarding,learing,or forwarding. D . RSTP also uses the STP proprsal-agreement sequence. E . RSTP use the same timer-baseed process as STP on point-to-point links. F . RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.

A . LDP hello packets are sent to UDP port 646 B . LDP hello packets are sent to TCP port 711 C . LDP sessions are TCP sessions to port 646 D . LDP sessions are TCP sessions to port 711 E . LDP establishes a peer relationship with another router that must be directly attached F . LDP can establishes a peer relationship with another router that is not directly attached

A . A final method in class X can be abstract if and only if X is abstract. B . A protected method in class X can be overridden by any subclass of X. C . A private static method can be called only within other static methods in class X. D . A non-static public final method in class X can be overridden in any subclass of X. E . A public static method in class X can be called by a subclass of X without explicitly referencing the class X. F . A method with the same signature as a private final method in class X can be implemented in a subclass of X. G . A protected method in class X can be overridden by a subclass of X only if the subclass is in the same package as X.

A . A single row subquery can retrieve only one column and one row. B . A single row subquery can retrieve only one row but many columns. C . A multiple row subquery can retrieve multiple rows and multiple columns. D . A multiple row subquery can be compared by using the ">" operator. E . A single row subquery can use the IN operator. F . A multiple row subquery can use the "=" operator.

A . A user cannot set privileges on the persistent lightweight jobs B . Persistent lightweight jobs generate a large amount of metadata C . It is possible to create fully self-contained persistent lightweight jobs D . The use of a template is mandatory to create persistent lightweight jobs E . Persistent lightweight jobs are useful when users need to create a large number of jobs in a short time

A . MPLS TE supports admission control B . MPLS TE tunnel traffic is a link attribute to compute the TE tunnel path C . MPLS TE uses BGP extension to advertise link attributes D . MPLS TE provides protection capability E . MPLS TE uses RSVP to establish LSP

A .  The default constructor initializes method variables. B .  The default constructor has the same access as its class. C .  The default constructor invoked the no-arg constructor of the superclass. D .  If a class lacks a no-arg constructor， the compiler always creates a default constructor.  E .  The compiler creates a default constructor only when there are no other constructors for the class.

A . It has the same maximum hop count as version 1. B . It uses broadcasts for its routing updates. C . It is a classless routing protocol. D . It has a lower default administrative distance than RIP version 1. E . It supports authentication. F . It does not send the subnet mask in updates.

A .  A lightweight AP receives control and configuration from a WLAN controller to which it is associated. B .  A WLAN client that is operating in half-duplex mode will delay all clients in that WLAN C .  A dhoc mode allows mobile clients to connect directly without an intermediate AP D .  Another term for infrastructure mode is independent service set （IBSS） E .  The Aironet 1230 access point is an example of an access point that operates solely as a lightweight  access point. F .  WLANs are designed to share the medium and can easily handle an increased demand of channel  contention.

A . Autoroute causes the tunnel to be treated as a directly connected link to the head-end. B . Autoroute causes the TE head-end to establish IGP adjacency with the tail-end over the tunnel. C . Forwarding adjacency makes the TE head-end node advertise the Tunnel LSP into the IGP. D . Forwarding adjacency supports unequal cost load balancing over multiple TE tunnels.

A . TE tunnels that are configured with the FRR option cannot be used as backup tunnels. B . TE tunnels that are configured with the FRR option can be used as backup tunnels. C . The backup tunnel that is used to protect a physical interface must have a valid IP address configured. D . Interfaces must use MPLS global label allocation. E . The source IP address of use backup tunnel and the merge point （MP） should not be reachable.

A . The virtual routing and forwarding table is separate from the global routing table that exists on PE routers. Routes are injected into the VRF from the CE-PE routing protocols for that VRF and any MP-BGP announcements that match the defined VRF RTs B . Multiprotocol Border Gateway Protocol is run between PE and CE routers to exchange customer prefixes in a VPNv4 format C . A customer edge router peers at Layer 3 to the provider edge. The PE-CE interface runs either a dynamic routing protocol （eBGP， RIPv2， EIGRP， OSPF） or a static routing protocol （Static， Connected） D . VPNv4 address is the combination of the RT and customer IPv4 prefix. These VPNv4 prefixes are passed in MP-BGP

A . Site Of Origin SOO B . Route-Target C . Route-Distinguisher D . Domain Identifier BGP extended commumity

A . start LDP B . enable CEF switching C . configure the MPLS ID D . disable IP TTL propagation E . configure conditional label advertising F . enable label switching on frame mode interface