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Exam Code: 400-101
Exam Name: CCIE Routing and Switching (v5.0)
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Q471. With which ISs will an IS-IS Level 1 IS exchange routing information?
A. Level 1 ISs
B. Level 1 ISs in the same area
C. Level 1 and Level 2 ISs
D. Level 2 ISs
IS-IS differs from OSPF in the way that "areas" are defined and routed between. IS-IS routers are designated as being: Level 1 (intra-area); Level 2 (inter area); or Level 1-2 (both). Level 2 routers are inter area routers that can only form relationships with other Level 2 routers. Routing information is exchanged between Level 1 routers and other Level 1 routers, and Level 2 routers only exchange information with other Level 2 routers. Level 1-2 routers exchange information with both levels and are used to connect the inter area routers with the intra area routers.
Q472. Which two statements about SNMP are true? (Choose two.)
A. SNMPv3 provides privacy and access control.
B. All SNMP versions use get, getNext, and getBulk operations.
C. SNMPv3 uses encrypted community strings.
D. SNMPv1 and SNMPv2c use plaintext community strings.
E. All SNMP versions support bulk retrieval and detailed error messages.
Q473. Which two statements about Cisco Express Forwarding are true? (Choose two.)
A. Cisco Express Forwarding tables contain reachability information and adjacency tables contain forwarding information.
B. Cisco Express Forwarding tables contain forwarding information and adjacency tables contain reachability information.
C. Changing MAC header rewrite strings requires cache validation.
D. Adjacency tables and Cisco Express Forwarding tables can be built separately.
E. Adjacency tables and Cisco Express Forwarding tables require packet process-switching.
Main Components of CEF
Information conventionally stored in a route cache is stored in several data structures for Cisco Express Forwarding switching. The data structures provide optimized lookup for efficient packet forwarding. The two main components of Cisco Express Forwarding operation are the forwarding information base (FIB) and the adjacency tables. The FIB is conceptually similar to a routing table or information base. A router uses this lookup table to make destination-based switching decisions during Cisco Express Forwarding operation. The FIB is updated when changes occur in the network and contains all routes known at the time. Adjacency tables maintain Layer 2 next-hop addresses for all FIB entries. This separation of the reachability information (in the Cisco Express Forwarding table) and the forwarding information (in the adjacency table), provides a number of benefits:
. The adjacency table can be built separately from the Cisco Express Forwarding table, allowing both to be built without any packets being process-switched.
. The MAC header rewrite used to forward a packet is not stored in cache entries, so changes in a MAC header rewrite string do not require validation of cache entries.
Q474. What is the destination address of an IGMPv2 general membership query?
D. the multicast group address
Q475. Which two statements describe characteristics of HDLC on Cisco routers? (Choose two.)
A. It supports multiple Layer 3 protocols.
B. It supports multiplexing.
C. It supports only synchronous interfaces.
D. It supports authentication.
Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links using HDLC. Cisco HDLC also provides a simple control protocol called Serial Line Address Resolution Protocol (SLARP) to maintain serial link keepalives. Cisco HDLC is the default for data encapsulation at Layer 2 (data link) of the Open System Interconnection (OSI) stack for efficient packet delineation and error control. The absence of a protocol type field in the HDLC header posed a problem for links that carried traffic from more than one Layer 3 protocol. Cisco, therefore, added an extra Type field to the HDLC header, creating a Cisco-specific version of HDLC. Cisco routers can support multiple network layer protocols on the same HDLC link. For example an HDLC link between two Cisco routers can forward both IPv4 and IPv6 packets because the Type field can identify which type of packet is carried inside each HDLC frame.
Q476. Which three protocols support SSM? (Choose three.)
C. IGMP v3lite
Q477. By default, how does a GET VPN group member router handle traffic when it is unable to register to a key server?
A. All traffic is queued until registration is successful or the queue is full.
B. All traffic is forwarded through the router unencrypted.
C. All traffic is forwarded through the router encrypted.
D. All traffic through the router is dropped.
In the basic GETVPN configuration, the traffic passing through group members will be sent in clear until it registers with the Key Server. This is because the crypto ACL is configured on the KS and GM will get that information only after the registration is successful. This means for a short period of time the traffic can go out unencrypted after a GM is booted up or the existing GETVPN session is cleared manually. This mode is called “fail open” and it is the default behavior. This behavior can be turned off by configuring “Fail Close” mode on the GMs.
Q478. DRAG DROP
Drag and drop the method for refreshing BGP prefixes on the left to the corresponding description on the right.
Q479. Which two statements about 802.1Q tunneling are true? (Choose two.)
A. It requires a system MTU of at least 1504 bytes.
B. The default configuration sends Cisco Discovery Protocol, STP, and VTP information.
C. Traffic that traverses the tunnel is encrypted.
D. It is supported on private VLAN ports.
E. MAC-based QoS and UDLD are supported on tunnel ports.
F. Its maximum allowable system MTU is 1546 bytes.
Q480. DRAG DROP
Drag and drop each step of the Unicast RPF process on the left into the correct order on the right.
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