QUESTION 101
Refer to the exhibit. Statements A, B, C, and D of ACL 10 have been entered in the shown order and applied to interface E0 inbound, to prevent all hosts (except those whose addresses are the first and last IP of subnet 172.21.1.128/28) from accessing the network. But as is, the ACL does not restrict anyone from the network. How can the ACL statements be re-arranged so that the system works as intended?

A.    ACDB
B.    BADC
C.    DBAC
D.    CDBA

Answer: D
Explanation:
Routers go line by line through an access list until a match is found and then will not look any further, even if a more specific of better match is found later on in the access list. So, it it best to begin with the most specific entries first, in this cast the two hosts in line C and D. Then, include the subnet (B) and then finally the rest of the traffic (A).

QUESTION 102
The output of the show frame-relay pvc command shows “PVC STATUS = INACTIVE”. What does this mean?

A.    The PVC is configured correctly and is operating normally, but no data packets have been detected
for more than five minutes.
B.    The PVC is configured correctly, is operating normally, and is no longer actively seeking the address
of the remote router.
C.    The PVC is configured correctly, is operating normally, and is waiting for interesting traffic to trigger
a call to the remote router.
D.    The PVC is configured correctly on the local switch, but there is a problem on the remote end of the PVC.
E.    The PVC is not configured on the local switch.

Answer: D
Explanation:
The PVC STATUS displays the status of the PVC. The DCE device creates and sends the report to the DTE devices. There are 4 statuses:
+ ACTIVE: the PVC is operational and can transmit data + INACTIVE: the connection from the local router to the switch is working, but the connection to the remote router is not available
+ DELETED: the PVC is not present and no LMI information is being received from the Frame Relay switch
+ STATIC: the Local Management Interface (LMI) mechanism on the interface is disabled (by using the “no keepalive” command). This status is rarely seen so it is ignored in some books.

QUESTION 103
Which command is used to enable CHAP authentication, with PAP as the fallback method, on a serial interface?

A.    Router(config-if)# ppp authentication chap fallback ppp
B.    Router(config-if)# ppp authentication chap pap
C.    Router(config-if)# authentication ppp chap fallback ppp
D.    Router(config-if)# authentication ppp chap pap

Answer: B
Explanation:
This command tells the router to first use CHAP and then go to PAP if CHAP isn’t available.

QUESTION 104
Which protocol is an open standard protocol framework that is commonly used in VPNs, to provide secure end-to-end communications?

A.    RSA
B.    L2TP
C.    IPsec
D.    PPTP

Answer: C
Explanation:
IPSec is a framework of open standards that provides data confidentiality, data integrity, and data authentication between participating peers at the IP layer. IPSec can be used to protect one or more data flows between IPSec peers.

QUESTION 105
At which layer of the OSI model does PPP perform?

A.    Layer 2
B.    Layer 3
C.    Layer 4
D.    Layer 5

Answer: A
Explanation:
The Point-to-Point Protocol (PPP) provides a standard method for transporting multi-protocol datagrams over point-to-point links. PPP was originally emerged as an encapsulation protocol for transporting IP traffic between two peers. It is a data link layer protocol (layer 2 in the OSI model )

QUESTION 106
The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command?

A.    This command should be executed from the global configuration mode.
B.    The IP address 10.121.16.8 is the local router port used to forward data.
C.    102 is the remote DLCI that will receive the information.
D.    This command is required for all Frame Relay configurations.
E.    The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC.

Answer: E
Explanation:
Broadcast is added to the configurations of the frame relay, so the PVC supports broadcast, allowing the routing protocol updates that use the broadcast update mechanism to be forwarded across itself.

QUESTION 107
Which two options are valid WAN connectivity methods? (Choose two.)

A.    PPP
B.    WAP
C.    DSL
D.    L2TPv3
E.    Ethernet

Answer: AC
Explanation:
The Point-to-Point Protocol (PPP) provides a standard method for transporting multi-protocol datagrams over point-to-point links. PPP was originally emerged as an encapsulation protocol for transporting IP traffic between two peers. It is a data link layer protocol used for WAN connections.
DSL is also considered a WAN connection, as it can be used to connect networks, typically when used with VPN technology.

QUESTION 108
Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mechanisms?

A.    HDLC
B.    PPP
C.    X.25
D.    Frame Relay

Answer: B
Explanation:
PPP: Provides router-to-router and host-to-network connections over synchronous and asynchronous circuits. PPP was designed to work with several network layer protocols, including IP. PPP also has built-in security mechanisms, such as Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP).

QUESTION 109
Which encapsulation type is a Frame Relay encapsulation type that is supported by Cisco routers?

A.    IETF
B.    ANSI Annex D
C.    Q9333-A Annex A
D.    HDLC

Answer: A
Explanation:
Cisco supports two Frame Relay encapsulation types: the Cisco encapsulation and the IETF Frame Relay encapsulation, which is in conformance with RFC 1490 and RFC 2427. The former is often used to connect two Cisco routers while the latter is used to connect a Cisco router to a non-Cisco router. You can test with your Cisco router when typing the command Router(config-if)# encapsulation frame-relay ? on a WAN link. Below is the output of this command (notice Cisco is the default encapsulation so it is not listed here, just press Enter to use it).

Note: Three LMI options are supported by Cisco routers are ansi, Cisco, and Q933a. They represent the ANSI Annex D, Cisco, and ITU Q933-A (Annex A) LMI types, respectively. HDLC is a WAN protocol same as Frame-Relay and PPP so it is not a Frame Relay encapsulation type.

QUESTION 110
Refer to the exhibit. What is the meaning of the term dynamic as displayed in the output of the show frame-relay map command shown?

A.    The Serial0/0 interface is passing traffic.
B.    The DLCI 100 was dynamically allocated by the router.
C.    The Serial0/0 interface acquired the IP address of 172.16.3.1 from a DHCP server.
D.    The DLCI 100 will be dynamically changed as required to adapt to changes in the Frame Relay cloud.
E.    The mapping between DLCI 100 and the end station IP address 172.16.3.1 was learned through Inverse ARP.

Answer: E
Explanation:
Inverse Address Resolution Protocol (Inverse ARP) was developed to provide a mechanism for dynamic DLCI to Layer 3 address maps. Inverse ARP works much the same way Address Resolution Protocol (ARP) works on a LAN. However, with ARP, the device knows the Layer 3 IP address and needs to know the remote data link MAC address. With Inverse ARP, the router knows the Layer 2 address which is the DLCI, but needs to know the remote Layer 3 IP address. When using dynamic address mapping, Inverse ARP requests a next-hop protocol address for each active PVC. Once the requesting router receives an Inverse ARP response, it updates its DLCI-to-Layer 3 address mapping table. Dynamic address mapping is enabled by default for all protocols enabled on a physical interface. If the Frame Relay environment supports LMI autosensing and Inverse ARP, dynamic address mapping takes place automatically. Therefore, no static address mapping is required.

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