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NEW QUESTION # 24
What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?
Answer: B
Explanation:
Explanation
The maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation is 1476 bytes1. This is because GRE packets are formed by the addition of the original packets and the required GRE headers1. These headers are 24-bytes in length and since these headers are added to the original frame, depending on the original size of the packet we may run into IP MTU problems1. The most common IP MTU is 1500-bytes in length (Ethernet)1. When the tunnel is created, it deducts the 24-bytes it needs to encapsulate the passenger protocols and that is the IP MTU it will use1. For example, if we are forming a tunnel over FastEthernet (IP MTU 1500)the IOS calculates the IP MTU on the tunnel as: 1500-bytes from Ethernet -
24-bytes for the GRE encapsulation = 1476-Bytes1.
NEW QUESTION # 25
Which statement concerning Bidirectional Forwarding Detection (BFD) is true for the configuration shown in the exhibit?
Answer: C
NEW QUESTION # 26
Click the Exhibit button.
Which two statements about the firewall filter terms shown in the exhibit are true? (Choose two.)
Answer: A,C
Explanation:
A firewall filter is a Junos security solution to filter or control traffic at the data plane as they enter or exit an interface 1 . A firewall filter consists of one or more terms, each with a set of conditions and actions 2 . The device evaluates every packet against the firewall filter terms in the order they are defined, and performs the actions specified in the first term that matches the packet 3 . If no term matches the packet, the device discards the packet by default 3 .
In the exhibit, the firewall filter mac-address is applied to the family ethernet-switching and involves filtering MAC addresses. There are two terms, term one and term two , each with different conditions and actions. The from statement specifies the match conditions, and the then statement specifies the actions. If the from statement is omitted, all packets are considered to match and the actions in the then statement are taken 2 . If the then statement is omitted, the packets that match the conditions in the from statement are accepted by default 2 .
* Term one logs traffic from a specific source MAC address 88:05:00:29:3c:de/48 . The log action is a nonterminating action, which means that the device continues to evaluate the packet against the remaining terms in the filter 2 . Therefore, traffic that matches the from statement in term one is not discarded, and option A is incorrect.
* Term two accepts all other traffic not specified in term one. The then accept action is a terminating action, which means that the device stops evaluating the packet against the filter and forwards the packet 2 . Therefore, all traffic not matching the from statement in term one is accepted by term two, and option D is correct.
* Term two does not have a from statement, which means that all packets are considered to match this term. Therefore, traffic matching the from statement in term two is not logged, and option B is incorrect.
* Term one does not have a then statement other than the log action, which means that the packets that match the from statement are accepted by default. Therefore, traffic that matches the from statement in term one is accepted, and option C is correct.
References:
2 : term (Firewall Filter)
3 : Firewall Filters Overview
1 : Juniper Firewall Filter Configuration Example
NEW QUESTION # 27
What is the default MAC age-out timer on an EX Series switch?
Answer: C
Explanation:
The default MAC age-out timer on an EX Series switch is 300 seconds 1 2 . The MAC age-out timer is the maximum time that an entry can remain in the MAC table before it "ages out," or is removed 3 1 . This configuration can influence efficiency of network resource use by affecting the amount of traffic that is flooded to all interfaces 1 . When traffic is received for MAC addresses no longer in the Ethernet routing table, the router floods the traffic to all interfaces 1 .
NEW QUESTION # 28
In addition to the MAC addresses, what information is stored in the bridging table? (Choose two.)
Answer: B,D
Explanation:
The bridging table is a data structure that stores the MAC addresses and the associated interface details and MAC learned time for each MAC address. The bridging table is used by the switch to forward frames based on the destination MAC address. The ether type details and the preamble of Ethernet packet are not stored in the bridging table, as they are not relevant for the switching process. References:
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
* [Junos OS Layer 2 Configuration Guide - TechLibrary - Juniper Networks]
* [Junos OS Layer 2 Configuration Guide - TechLibrary - Juniper Networks]
NEW QUESTION # 29
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